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Western blot analysis of HBx protein expression in transfected HepG2 (lanes 1-3) and QBC939 (lanes 4 -6) cell lines. A marked expression of HBx protein was observed in HepG2 and QBC939 cells when transfected with pCMV -X vector (lanes 2 and 5), but there were no such protein expression in those when transfected with OPTI-MEM medium (lanes 1 and 4) and blank vector (lanes 3 and 6). M: Protein marker.
