upon stimulation with the chemotactic factors formyl-methionyl-leucyl-phenylalanine , c5a and platelet activating factor , the non-chemotactic ionophore a23187 , and the chemotaxis inhibitors tumor necrosis factor ( tnf alpha ) and lymphotoxin ( tnf beta ) adherent pmn produced considerably more reactive oxygen metabolites than suspended cells .
C0008013
chemotactic factors
C0027229
formyl-methionyl-leucyl-phenylalanine