The binding of antibody to foreign substances facilitates their destruction.
Bone marrow is the source of all blood cells.
Although most diseases have some genetic component, the term genetic disease is usually applied to those cases where one or two genes determine the disease, such as sickle cell anemia, Tay-Sachs disease, and cystic fibrosis. These molecules have a role in regulating the immune response in general. These are the autoimmune, allergic, and immunodeficiency diseases.