Potent platelet activator that aggregates platelets via both GPIbalpha (GP1BA) and GPVI (GP6). Induces a tyrosine phosphorylation profile in platelets that resembles this produced by collagen, involving the time dependent tyrosine phosphorylation of Fc receptor gamma chain (FCGR1A), phospholipase Cgamma2 (PLCG2), and LAT. Heterotetramer of the subunits alpha, alpha', beta and beta'; disulfide-linked. Expressed by the venom gland. Belongs to the snaclec family.