Binds to and neutralizes the activities of basic phospholipase A2 (PLA2) myotoxin isoforms. Oligomer composed of five 23-25 kDa subunits (PubMed:9307037). Homotrimer; non-covalently linked (By similarity). Secreted in plasma. Expressed by the liver. Contains 2 disulfide bonds. Belongs to the alpha-type phospholipase A2 inhibitor family.