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helper T cell

lymphocyte bearing the CD4 marker. Helper T cells are the chief regulatory cells of the immune response. They are responsible for many immune system functions, including turning antibody production on and off.

hemoglobin

the oxygen-carrying part of the red blood cell.

hepatocyte

liver cell.

host

a plant or animal harboring another organism.

hypnozoite

a form of the malaria parasite that remains inactive within the liver and can produce relapses.