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sirolimus (sir-OH-lih-mus)

 A drug used to prevent the rejection of organ and bone marrow transplants by the body. Sirolimus is an antibiotic that blocks a protein involved in cell division and inhibits the growth and function of certain T cells of the immune system that are involved in the body's rejection of foreign tissues and organs. It is a type of immunosuppressant and a type of serine/threonine kinase inhibitor. Sirolimus was previously called rapamycin. Also called Rapamune.

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