SDS-10% PAGE analysis of the expression products of E. coli M15 harboring pQE30/sxh56. Lane M, protein molecular weight marker; lanes 1 to 3, E. coli M15 harboring pQE30/sxh56 induced by IPTG; lane 4, E. coli M15 harboring pQE30 induced by IPTG; lane 5, E. coli M15 induced by IPTG; lane 6, protein expressed as inclusion bodies; lane 7, supernatant of supersonic crash.