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cyclosporin A[¦sī·klə‚spȯr·ən ′ā]
A cyclic peptide produced by some fungi. It inactivates helper T cells, making it useful as an immunosuppressive drug, especially in the prevention of graft rejection in transplantation surgery.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.