the activated complex of the fifth component of complement C5a induces chemotaxis in the case of polymorphonuclear leukocytes.
com·ple·ment che·mo·tac·tic fac·tor
(kom'plĕ-mĕnt kē'mō-tak'tik fak'tŏr) The activated complex of the fifth, sixth, and seventh components of complement (C567), which induces chemotaxis of polymorphonuclear leukocytes.