Inhibits the enzymatic activity of phospholipase A2 (PA2) (PubMed:10924158). Binds to the major PLA2 toxin of D.russelli siamensis (Daboiatoxin, AC Q7T2R1, and AC Q7T3T5) at 1-2-fold molar excess of inhibitor to toxin (PubMed:10924158). It exhibits broad spectra in neutralizing the toxicity of various snake venoms and toxins and inhibits the formation of edema in mice (PubMed:10924158). May bind to PLA2 through its proline-rich hydrophobic core region (Probable). Homohexamer. Secreted in blood plasma. Expressed by the liver. Glycosylated. Belongs to the CNF-like-inhibitor family.