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Meaning of transfer factor

trans'fer fac"tor

Pronunciation: [key]
— Immunol. Immunol.
  1. a lymphocyte product that, when extracted from T cells of an individual with immunity to a particular antigen, can confer that immunity when administered to another individual of the same species.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.