Inhibits the enzymatic activity of the phospholipase A2 (PLA2). Heteromer composed of subunit A and subunit B. Secreted in blood plasma. Expressed by the liver. Concentration of this protein in the serum is 8-fold lower than in the E.quadrivirgata (another non-venomous snake) serum. This difference may reflect the difference in the food habits of these snakes. E.quadrivirgata preys upon snakes including the venomous snakes, whereas E.climacophora only preys upon small mammals and birds. Belongs to the CNF-like-inhibitor family.