Inhibits the enzymatic activity of all phospholipase A2 (PA2) groups. Heterodimer of subunit A and subunit B. Secreted in blood plasma. Expressed by the liver. Not expressed in esophagus, stomach, pancreas, spleen, gall bladder, small intestine, rectum, kidney, trachea, lung, testis and body fat. N-glycosylated. Belongs to the CNF-like-inhibitor family.