Purity ~90% (SDS-PAGE). Type IV collagen is the major structural component of glomerular basent membranes (GBM), forming a 'chicken-wire' meshwork together with laminins, proteoglycans and entactin/nidogen. Canstatin, a cleavage product corresponding to the collagen alpha 2(IV) NC1 domain, possesses both anti-angiogenic and anti-tumor cell activity. It inhibits proliferation and migration of endothelial cells, reduces mitochondrial membrane potential, and induces apoptosis. Specifically induces Fas-dependent apoptosis and activates procaspase-8 and -9 activity. Ligand for alphavbeta3 and alphavbeta5 integrins. Source: Recombinant protein corresponding to aa1493-1712 from human COL4A2, fused to His-Tag at N-terminal, expressed in E. coli. Molecular Weight: ~28.3kD AA