To construct the recombinant plasmid containing envelope glycoprotein E2 gene of RV JR23 strain, to express E2 protein in BHK21 cells, and to analyze the antigenic sites of E2 protein of RV JR23 strain, E2 gene of RV JR23 strain was amplified by RT-PCR. The PCR product was cloned into the expression vector pBluescript Ⅱ SK~+ and transformed into E. coli JM109, and the recombinant plasmid was transfected into BHK21 cells with recombinant vaccinia virus VTF-7. The expression was detected by immunohistochemist...