1. Source: from Chinese Cobra Venom 2. Usage fields: (1) By way of treatment purpose: This product is wildly used to cure urgent exclude reaction of heterotransplantation, delay reaction and breath embarrassment syndrome. (2) By way of reagent purpose: For the reason that the product has much better stabilization, high effect rate and strong single mature of anti-complement, it is an ideal tool in the research and application of molecular immunology and clinic immunology. 3. Mol wt: composed of 3 different substructures with different mol wt; its relative mol wt is about 145800. 4. Physical status: white lyophilized powder. 5. Identification of biological activity: A: Identification of snake venom factor hemolytic activity B: identification of snake venom factor anti-complementary activity 6. Storage: -20℃