purification of human platelet phospholipase a2 ( pla2 ) from a particulate fraction by ion-exchange chromatography at 4 degrees c yielded a single peak of enzyme activity , which catalyzed the hydrolysis of arachidonic acid from the 2-position of phosphatidylcholine ( ptdcho ) and phosphatidylethanolamine ( ptdetn ) .
C3539768
human
C0020291
hydrolysis