Immunoglobulins

Antibodies, also known as immunoglobulins, are Y-shaped proteins produced by plasma cells in response to antigens. They have antigen binding sites that recognize specific antigens with high specificity. There are five main classes of immunoglobulins - IgG, IgM, IgA, IgD, and IgE - which differ in structure, concentration in serum, location in the body, and functions such as enhancing phagocytosis, neutralizing pathogens, and initiating immune responses.