(rapamycin) n. an immunosuppressant drug used to prevent rejection in kidney transplantation. Sirolimus was first discovered as a product of the bacterium Streptomyces hygroscopicus in a soil sample from Rapa Nui (the Polynesian name for Easter Island), hence the alternative name. It blocks the activation of B and T lymphocytes by *interleukin 2 (IL-2).... sirolimus
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