Molecule of the Week


October 12, 2009

Rapamycin, also called sirolimus, is an immunosuppressant drug that is used to prevent the rejection of transplanted organs. It was first described in 1975 by C. VÉzina and co-workers as a product of the bacterium Streptomyces hygroscopicus. Wyeth markets it under the trade name Rapamune. In July of this year, D. E. Harrison and colleagues reported that rapamycin extends the life span of laboratory animals.

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