This document discusses hematopoietic stem cells (HSCs), which give rise to other blood cells through hematopoiesis in the bone marrow. HSCs can be isolated from bone marrow, umbilical cord blood, and peripheral blood. They express surface markers like CD34, CD38, CD90, and CD133 that allow their detection. HSCs have applications in hematopoietic stem cell transplantation to treat patients after intensive chemotherapy damages their bone marrow. Other applications of stem cells discussed are for treating baldness, diabetes, and myocardial infarction.