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.