Lectin that displays hemagglutinating activity on all types of trypsinized human erythrocytes (A+, B+, AB+, and O+), with a higher sensitivity to AB+ type. Is inhibited by different carbohydrates with alpha-lactose displaying the most potent ability to block agglutination (followed by D-fucose, D-galactose, D-rhamnose, D-mannose, and D-sucrose). Is also inhibited by EDTA and pretreatment with heat. In addition, it induces significant cell death in HL-60 cells in a dose-dependent manner, with an IC(50) close to 250 ug/ml. Is a calcium-dependent lectin. Homodimer; disulfide-linked. Expressed by the venom gland. In contrast to B.atrox venom, does not induce edema in mouse paw nor does it induce mast cell degranulation (tested on RBL-2H3 cell line). Has no significant effect on plasma coagulation in vitro nor does it induce platelet aggregation (PubMed:21297119). Belongs to the true venom lectin family.