To study the molecular biological characteristics and subcellular localization of RNAdependent RNA polymerase(RdRp) of duck hepatitis A virus(DHAV),the recombinant plasmid pEGFPRdRp containing RdRp fused with the green fluorescent protein(GFP) was constructed. After transfected into MDCK cells,the expression of RdRp was detected with fluorescence microscope and Western-blotting, and the results showed that RdRp fused with GFP was expressed well in the MDCK cells. Besides, the localization of RdRp in MDCK cells was determined with laser co...