The cDNA fragments of gene vp2 and hv were inserted respectively into the EcoR I site of integration plasmid pR to obtain the recombinant display plasmids pR-VP2 and pR-HV.

• 3、分别将vp2和hv基因的cDNA片段插入整合质粒pR的EcoR I位点，获得重组质粒pR-VP2和pR-HV。