Purity > 95% determined by SDS-PAGE. Endotoxin <1.0 EU per μg protein as determined by the LAL method. Activity: Measured by its ability to inhibit the proliferation of MPC-11 cells. The ED50 for this effect is 4-16ng / mL. Protein Construction: A DNA sequence encoding a mature form of human/mouse/rat/cynomolgus/rhesus INHBA (NP_002183.1) (Gly311-Ser426) was expressed.