in contrast to the deactivation of chemotaxis achieved by preincubation of neutrophils with other chemotactic factors , prior exposure to 10 ( -6 ) m pf4 ( 59-70 ) for 2 min , or 20 min at 37 degrees , enhanced by 1.5- to 2-fold the chemotactic responses of neutrophils evoked by optimal concentrations of fmlp , c5fr , leukotriene b4 , and pf4 ( 59-70 ) .
C0008013
chemotactic factors
C0027229
fmlp