Purity ~85% (SDS-PAGE). Growth factor that binds to EGFR, ERBB4 and other EGF receptor family members. Potent mitogen for retinal pigment epithelial cells and vascular smooth muscle cells. Source: Recombinant protein corresponding to aa32-173 from human Probetacellulin, fused to GST-Tag at N-terminal, expressed in E. coli. AA