Nine mutants(P2M1–9) were obtained using PCR with 5-BU based on DNA template(P2Y) encoding the active region of Parasporin-2.Mutant proteins were purified after expressing in E.coli BL21 cells,followed by assayed against hepatoma cells and normal liver cells by MTT.They showed diverse anti-hepatoma activities,in which two mutant proteins,P2M1 and P2M8,exhibited high cytotoxicity against hepatoma cell lines SMMC7721 and Bel7402,meanwhile leaving normal liver cells Chang-liver unaffected.Structural comparison...