Is a potent glycoprotein Ibalpha (GP1BA) antagonist. Concentration-dependently inhibits botrocetin-, ristocetin- and low dose thrombin-induced platelet aggregation. Inhibits platelet adhesion only through inhibiting the vWF interaction with GP1BA, but has minimal effect on other platelet receptors, such as alpha-IIb/beta-3 (ITGA2B/ITGB3) or alpha-2/beta-1 (ITGA2/ITGB1). Causes an instant severe thrombocytopenia in rats and is not lethal to mice. Heterodimer of subunits alpha and beta; disulfide-linked. Expressed by the venom gland. Lacks hemorrhagic activity in rabbits. Has no inhibitory effect on the coagulation cascade of humans. Does not agglutinate human erythrocytes of four groups (AC, BC, OC, ABK) and rabbit erythrocytes as well, which indicates it is not really a lectin (PubMed:15777951). Belongs to the snaclec family.