The humoral part of the immune system includes antibodies and immunoglobulins in blood serum. Lymphocyte A type of white blood cell that is important in the formation of antibodies. Orphan drug A drug that is known to be useful in treatment but lacks sufficient funding for further research and development. An orphan drug that is useful in treating SCID related to ADA deficiency. T cells Lymphocytes that originate in the thymus gland.
T cells regulate the immune system's response to infections.
Thrush A disease of the mouth caused by a yeast, Further Reading Books Abbas, Abul K., et al. Cellular and Molecular Immunology. W. B. Saunders Company, 1997. In The Merck Manual of Diagnosis and Therapy, edited by Robert Berkow, et al. Merck Research Laboratories, 1992.