Factor VII Human Plasma. Factor VII, Source: Human Plasma, Physical Form Description: In 20 mM Tris-HCl, 0.1 M NaCl, 1 mM Benzamidine, pH 7.4, Molecular Weight: 50 kDa, Purity: greater than or equal to 95%, Synonyms: Proconvertin, Serum prothrombin conversion accelerator, Size: 50 ug