The document discusses the body's normal immune tolerance to self antigens and how autoimmunity can arise when tolerance is broken. It provides several potential triggers for autoimmunity, including viral infection, certain drugs, molecular mimicry between foreign and self antigens, hormones, defects in the immune network, and bypassing regulatory T cells. Autoantibodies can be present at low levels normally but disease occurs when their production increases massively due to multiple interacting factors occurring in the right space and time.
An undergraduate lecture on immunologic tolerance, it's various types and how a breakdown of tolerance contributes to the pathogenesis of autoimmune diseases. Additionally a small quiz at the end to gauge the students' learning.
An undergraduate lecture on immunologic tolerance, it's various types and how a breakdown of tolerance contributes to the pathogenesis of autoimmune diseases. Additionally a small quiz at the end to gauge the students' learning.
Your body's immune system protects you from disease and infection. But if you have an autoimmune disease, your immune system attacks healthy cells in your body by mistake. Autoimmune diseases can affect many parts of the body.
No one is sure what causes autoimmune diseases. They do tend to run in families. Women - particularly African-American, Hispanic-American, and Native-American women - have a higher risk for some autoimmune diseases.
There are more than 80 types of autoimmune diseases, and some have similar symptoms. This makes it hard for your health care provider to know if you really have one of these diseases, and if so, which one. Getting a diagnosis can be frustrating and stressful. Often, the first symptoms are fatigue, muscle aches and a low fever. The classic sign of an autoimmune disease is inflammation, which can cause redness, heat, pain and swelling.
The diseases may also have flare-ups, when they get worse, and remissions, when symptoms get better or disappear. Treatment depends on the disease, but in most cases one important goal is to reduce inflammation. Sometimes doctors prescribe corticosteroids or other drugs that reduce your immune response.
The organism possesses powerful mechanism to avoid immune auto aggression, The acquired ability of the immune system to avoid responsiveness to self antigens is defined as ‘ tolerance’ It is obtained by the cooperative efforts of central and peripheral mechanisms, which allow a rapid and efficient removal of pathogens ( Virus and Bacteria ) in the absence of self-recognition, It is a dysfunction of the immune system. The immune system protects you from disease and infection. Sometimes, though, the immune system can produce autoantibodies that attack healthy cells, tissues, and organs. This can lead to autoimmune disease.Autoimmune diseases can affect any part of the body
Tolerance & autoimmunity and organ specific autoimmune diseasesdr.Ihsan alsaimary
Dr. ihsan edan abdulkareem alsaimary
PROFESSOR IN MEDICAL MICROBIOLOGY AND MOLECULAR IMMUNOLOGY
ihsanalsaimary@gmail.com
mobile : 009647801410838
university of basrah - college of medicine - basrah -IRAQ
Your body's immune system protects you from disease and infection. But if you have an autoimmune disease, your immune system attacks healthy cells in your body by mistake. Autoimmune diseases can affect many parts of the body.
No one is sure what causes autoimmune diseases. They do tend to run in families. Women - particularly African-American, Hispanic-American, and Native-American women - have a higher risk for some autoimmune diseases.
There are more than 80 types of autoimmune diseases, and some have similar symptoms. This makes it hard for your health care provider to know if you really have one of these diseases, and if so, which one. Getting a diagnosis can be frustrating and stressful. Often, the first symptoms are fatigue, muscle aches and a low fever. The classic sign of an autoimmune disease is inflammation, which can cause redness, heat, pain and swelling.
The diseases may also have flare-ups, when they get worse, and remissions, when symptoms get better or disappear. Treatment depends on the disease, but in most cases one important goal is to reduce inflammation. Sometimes doctors prescribe corticosteroids or other drugs that reduce your immune response.
The organism possesses powerful mechanism to avoid immune auto aggression, The acquired ability of the immune system to avoid responsiveness to self antigens is defined as ‘ tolerance’ It is obtained by the cooperative efforts of central and peripheral mechanisms, which allow a rapid and efficient removal of pathogens ( Virus and Bacteria ) in the absence of self-recognition, It is a dysfunction of the immune system. The immune system protects you from disease and infection. Sometimes, though, the immune system can produce autoantibodies that attack healthy cells, tissues, and organs. This can lead to autoimmune disease.Autoimmune diseases can affect any part of the body
Tolerance & autoimmunity and organ specific autoimmune diseasesdr.Ihsan alsaimary
Dr. ihsan edan abdulkareem alsaimary
PROFESSOR IN MEDICAL MICROBIOLOGY AND MOLECULAR IMMUNOLOGY
ihsanalsaimary@gmail.com
mobile : 009647801410838
university of basrah - college of medicine - basrah -IRAQ
学びの場面での学習者と指導者の不安・恐れの物語、心理学的機序、教授システム学を応用した処方。
Stories and prescriptions for fear and anxiety in learning with instructional design for both learners and teachers.
心肺蘇生術コースから持ち帰り、現場で役立つ可能性があるのは、心肺蘇生術そのものよりも振り返り学習の技能である。
To gain ability of debriefing facilitation is primary goal of cardio-pulmonary resuscitation course, because debriefing would be used as learning method in daily practice of healthcare professionals.
Autoimmunity and Autoimmune diseases.pptxrajmonu7858
A concise ppt about autoimmunity. It incudes information about tolerance, etiology behind autoimmune diseases, types of autoimmune diseases and few examples of diseases.
Biochemistry of Hair fall, A complete review of hair fall cause, Types, Current methods of treatment, Natural methods of treatment,
for more detail text see :https://iiopinion.blogspot.in/2017/01/hair-fall-scientific-way-of-treatment.html
Non-Specific Immune Response, Innate immunity, inherent immunity, Role in overall immunity of individual, Significance, components involve in Non-Specific Immune Response,
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
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The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
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3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
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MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
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Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
2. Introduction
Normally, individuals do not form potentially
destructive Abs to their own cells, this is because the
body has developed a tolerance to the Ags (other than
Igs) normally present within self.
This state of
the immune
tolerance to
self Ags is
maintained by
a complex
network of T
and B
lymphocytes
and their
regulatory
products
In certain cases, we can
produce Abs to our own
cell or tissue components.
This type of Ab is called an
auto- Ab and the diseases
associated with Auto-Abs
are called autoimmune
diseases.
8/31/2015 6:33:54 AM 2
3. It is essential that the body be able to
recognize self from nonself for survival.
• Yet some physiological autoimmune reactivity against self-Ags (Abs)
can occur and is normal.
• The auto-Abs produced by this action serve as physiological
regulators of the immune system.
eg, the immune system
can distinguish self
MHC Ags on its own
cells from those on
foreign cells.
• It has been postulated that auto-Abs might also act as "biological
taxis," transporting cellular breakdown products for their ultimate
disposal.
• For example, myocardial infarcation (e.g., heart attack), we find
apparently harmless auto-Abs to heart tissue, whose function is to
clear away damaged heart tissue.
Thus, auto-Abs can exist
at normal physiological
levels as components of
the body's homeostatic
mechanisms.
• if it goes away and lymphocytes proliferate and large quantities of
auto-Abs are produced , autoimmune disease can occur.
But the appearance of
normal auto-Abs is a
carefully controlled
event:
8/31/2015 6:33:54 AM 3
4. THEORIES OF BREAKDOWN IN
SELF-TOLERANCE
There are several ways that auto-Abs formation can
be triggered.
Scientists have been
able to identify either
the precipitating event
that takes place just
prior to the expression
of disease
or the underlying
events that seen to
eventually lead to a
disease state, but not
both .
What was originally
thought to be a simple
matter of one common
biological trigger for
many autoimmune
disorders is now known
to be a puzzling
assortment of triggers,
which have to occur in
the right space and
time for disease to
occur.
8/31/2015 6:33:54 AM 4
5. i.e. in juvenile diabetes, complement-fixing auto-Abs to the insulin
producing cells of the pancreas cause their immune destruction
with subsequent expression of the clinical symptoms of diabetes.
When siblings of diabetics were tested, many possessed the
same IgG auto-Abs directed against pancreatic B cells, but
they showed no sign of disease.
However, within 3 to 7 years the siblings who tested positive
for auto-Abs became frankly diabetic.
This would indicate that there were other triggers that occur
before the disease manifested itself; it was not just the
presence of cytotoxic Abs that brought on the disease.
But final sequence of events is still unknown.
8/31/2015 6:33:55 AM 5
6. Another example suggesting that the presence of auto-Ab alone
is not sufficient to cause disease ie. autoimmune hemolytic
anemia.
In this disease, monoclonal auto-Abs are formed against
normal RBC constituents.
The Abs coat the erythrocytes, causing clumping, lysis and
premature clearance by the spleen.
The Coomb's test, (immunological test ) used to diagnose
this condition which can assess whether an individual's red
blood cells are coated with IgG Ab.
However, a +ve Coomb's test occurs without any evidence of
hemolytic disease in a small % of healthy blood donors.
Thus, although it is necessary for RBC to be coated with auto-
Ab in hemolytic anemia, other factors also must be involved in
order for disease to manifest itself.
8/31/2015 6:33:55 AM 6
7. Triggers At present many individual mechanisms have been
identified, but how they interact with the immune network has not
yet been elucidated.
The triggers for
autoimmune
diseases are
diverse and
include
immunological, genetic, viral,
drug-induced
and
hormonal
factors,
acting singly
or in
combination
, in time and
space.
8/31/2015 6:33:55 AM 7
8. Mechanisms
Mechanisms that have been shown to eventually cause a
breakdown of self tolerance include
(1)
infection
of somatic
tissue by
viruses,
(2)
developme
nt of
altered
self-Ags
due to
binding of
certain
drugs to
cell
surfaces•
(3) cross
reactivity
of some
Abs to
bacterial
Ags and
self-
determina
nts,
(4)
developme
nt of newly
exposed
Ags in the
body,
(5) the
influence
of
hormones,
and
(6)
breakdow
n in the
immune
network
that
recognizes
self.
8/31/2015 6:33:55 AM 8
9. A major focus of the immune system is to
maintain self in the body.
An event that could lead to a breakdown in self is
viral infection.
Since viruses can cause the display of viral Ags on the
surface of body cells, viral antigenic expression could
act to induce autoimmune diseases.
Many animal viruses can have a latent state, where
they remain hidden and noninfective for long time.
However, in this state they might still influence the
cell surface markers, which could lead to an
autoimmune response.
8/31/2015 6:33:55 AM 9
10. Causes of Autoimmunity
Viral
Binding of certain drugs
formation of Abs that cross-react
Hormones
breakdown in the immune network
production defects: germline or
somatic mutations of the B or T
Defects in Ag recognition
bypassing T cells.
8/31/2015 6:33:55 AM 10
11. Viruses can also induce autoimmune
disease
Viruses can also
induce autoimmune
diseases by
Viral infections prior
to disease have been
associated with
systemic lupus
erythematosus (SLE),
multiple sclerosis, and
diabetes.
• polyclonal activation of
lymphocytes,
• the release of subcellular
organelles after viral lysis of
the cell by antigenic mimicry
• or by functional impairment
of regulatory immunocytes
such as Ts or TH cells.
8/31/2015 6:33:56 AM 11
12. binding of certain drugs
Hemolytic anemia can be produced in susceptible people taking the
antibiotic penicillin.
Penicillin can bind to RBC and Abs that develop to the drug can
then bind to the foreign antigenic penicillin molecules.
It has been suggested that the membrane-bound penicillin can
initiate events that lead to the activation of lymphocytes, previously
silence by immune suppresser activity.
Subsequent Ab formation against erythrocyte Ags and complement
activation can lead to hemolysis and the onset of anemia.
8/31/2015 6:33:56 AM 12
13. formation of Abs that cross-react with host’Ags
that crossreact with Ag
For example, in syphilis, caused by the spirochete Treponema pallidum,
many people develop hemolytic anemia.
It is suggested that Abs raised against T. Ags can also crossreact with
certain RBC blood group Ags, thus bringing about the anemia.
Antigenic mimicry is also seen in the pathology of Chaga's disease.
There is evidence that Ags common to its causative agent, T cruzi, and
human cardiac muscle produce the immunopathological lesions seen in
this disease.
In addition, crossreactions of Ags against Streptococcus Group A bacteria
with human cardiac muscle are responsible for the myocardial effects of
rheumatic fever.
8/31/2015 6:33:56 AM 13
14. Hormones
Hormones seem to influence the expression of certain autoimmune
diseases as well.
hormones of hypothalamus, thyroid and adrenal affect the homeostasis of
the lymphoid system and responses to Ags, by unknown mechanisms.
SLE and RA (rheumatoid arthritis) preferentially afflict women, where as
more men develop myasthenia gravis.
The predisposing factors in these instances appear to be the sex hormones.
It is known that testosterone is immunoenhancing; mechanism is to be
elucidated.
8/31/2015 6:33:56 AM 14
15. Some breakdown in the immune network
that strictly monitors the expression of self.
The breakdown in the
immune network can
occur at many
different levels. It
could be at the level of
expression of a defect
in the functioning of
the immunocyte.
8/31/2015 6:33:56 AM 15
16. At the level of production defects,
It is known that
thymic
hormones, such
as
• Thymosin
• and thymopoietin,
• are essential for
differentiation of T
cells and their
helper, inducer,
suppressor, and
cytotoxic subsets.
There is also the possibility that germline or somatic
mutations produced defects in the B or T cells,
by adversely
affecting the
microenvironment
of either the
stem cells,
some other
precursor cell,
or the
differentiating
lymphoid cell.
8/31/2015 6:33:56 AM 16
17. Defects in Ag recognition
e.g number of immunoreactive
cells recognizing self-peptides-
MHC molecules within the
developing thymus, might not
be properly regulated.
Consequently, cells (which
should have been clonally
deleted) might remain.
These cells later could be
stimulated inappropriately by
combination with self-
components altered by disease
or other factors.
Furthermore, malfunction in
the regulation of T cell
expression could lead to
contrasuppression of T cell
function.
It is believed that TS
lymphocytes play an essential
role in maintaining immune
silence to certain self-
components found in somatic
tissue cells.
Interference with (or
contrasuppression of ) TS cell
activity could lead to
autoimmune diseases by
allowing the immune system to
interact positively with self-
Ags.
Alternatively, enhanced TH
cell activity could also disrupt
the immune network.
Unresponsiveness, to self-Ags
could be maintained by self-
tolerance at the level of the TH
cell.
If activated, these tolerant TH
cells could be induced to
activate B cells to produce
auto-Abs.
8/31/2015 6:33:56 AM 17
18. bypassing T cells.
Self reactive cells could be
directly stimulated by
polyclonal activators
such as lipopolysaccharides
(LPS), which can directly
activate B lymphocytes.
In this way, we could
circumvent (evade)the
tolerant T cells and by pass
the regulatory mechanisms.
This could lead to the direct
activation of specific B cells,
with subsequent formation
of Abs to self components.
This has led to the
suggestion that autoimmune
diseases arise through a
combination of polyclonal
and Ag-specific stimulation.
For example, polyclonal
stimulation could cause
expansion of B cell clones
expressing surface receptors
for self-Ags.
Subsequent encounter with
Ag would lead to activation .
Moreover, it is possible that
specific activation and self-
Ag-driven selection of
autoreactive B cells could
occur.
8/31/2015 6:33:56 AM 18
19. MECHANISM OF TISSUE DAMAGE IN
AUTOIMMUNE DISEASES
There are a
variety of
ways in
which an
autoimmune
response can
cause tissue
damage.
General mechanisms of action can be classified into the
following groups:
(1) damage by
complement-
fixing Abs raised
against auto-
Ags;
(2) compromise
of cellular
function when
auto-Abs bind to
the cell surface
receptors which
mediate,
degrade or block
expression of
differentiated
function;
(3) tissue
damage when
auto-Abs and
soluble self-Ags
form immune
complexes and
initiate a
destructive
inflammatory
response; and
(4) damage to
cells through
specific TC cell
responses
activated to
destroy self-
cellular Ags.
8/31/2015 6:33:56 AM 19
20. Diagnosis
Auto-Abs directed against self-Ags
located on the membrane of body
cells might bind to these Ags,
activate serum complement,
and cause cytolysis. This occurs in
autoimmune hemolytic anemia,
when IgG auto-Abs bind to certain
blood group Ags, fix complement,
and destroy the erythrocytes,
thereby causing anemia.
8/31/2015 6:33:56 AM 20
21. Auto-Abs can form against cell surface
receptors, eg hormone receptors.
These auto-Abs can either
Thus, the formation of a receptor-auto-Ab
complex alters the function and activity of
the receptor.
In myasthenia gravis, auto-Abs are
produced to myocyte acetycholine
receptors located at the neuromuscular
junction.
These Ags interfere with proper
neurotransmission, diminish the
contractility of the muscle cells and cause
fatigue and weakness.
In contrast, in thyrotoxicosis, binding of
auto-Abs stimulates the thyroid gland,
mimicking the action of the normal
hormone.
•mimic the function of the normal hormone,
•block hormone binding,
•or even degrade the receptor site.
8/31/2015 6:33:56 AM 21
22. Auto-Abs can be produced against soluble
self-Ags, which can form immune complexes
. This might lead to activation of the complement cascade, with
the formation of the anaphylactic and chemotactic fragments,
C3a and C5a.
Histamine is then released and phagocytic activity is increased,
causing an inflammatory response that is destructive to tissues
at the site of immune-complex formation.
This is the usual series of events during acute episodes in SLE,
when auto-Abs to DNA generate anti-DNA: DNA complexes
with subsequent inflammation.
8/31/2015 6:33:56 AM 22
23. DIAGNOSTIC TESTING
• immunofluorescence,
• agglutination, and
• radioimmunoassay.
Although,
selective
methods can
be employed
to detect each
autoimmune
disease,
testing
generally falls
into three
categories:
8/31/2015 6:33:56 AM 23
24. SELECTED AUTOIMMUNE DISEASES:
ORGAN SPECIFIC
The tissue
destruction that
occurs is
restricted to the
specific Ags
localized in that
organ. Hence,
the specific
auto-Ab will
not attack other
organs.
• Autoimmune
hemolytic anemia
• Drug-induced
immune hemolytic
anemia
• Autoimmune
Encephalomyelitis
• Goodpasture's
Syndrome Multiple
Sclerosis
• Multiple
Sclerosis(MS)
Myasthenia Gravis
8/31/2015 6:33:57 AM 24