four well-characterized chemotaxins , the complement fragment c5a , formyl-methionyl-leucyl-phenylalanine ( fmlp ) , platelet-activating factor ( paf ) , and leukotriene b4 ( ltb4 ) were used as stimuli .
C0008013
chemotaxins
C0027229
formyl-methionyl-leucyl-phenylalanine