In comparison , platelet activating factor ( PAF ) contributed to both phases of neutrophil adhesion .
in comparison , platelet activating factor ( paf ) contributed to both phases of neutrophil adhesion .
O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O O O O O O B-other_name I-other_name O