human pmns were isolated and pretreated with 0.25 to 4 micrograms/ml of gbs type iii antigen prior to determining their chemotactic response to the chemoattractants formyl-methionyl-leucyl-phenylalanine , zymosan-activated serum , platelet-activating factor , and leukotriene b4 .
C0008013
chemoattractants
C0027229
formyl-methionyl-leucyl-phenylalanine