Weakly agglutinates platelets at high doses by binding to GPIbalpha (GP1BA). Heterodimer of subunits alpha and beta; disulfide-linked. Expressed by the venom gland. Monoclonal antibodies to glycoprotein IIb/IIIa, to bovine vWF, and to bovine serum albumin did not show any effect on the binding of AL-B to platelets. Belongs to the snaclec family.