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Electrophoresis of the fragments of HBV S gene. Lane 1: HB fragment of complete HBV S gene; Lane 2: HB-SD fragment with the second-loop deletion of the α determinant; Lane 3: DNA fragment of HBV S gene from codon 1 to codon 138; Lane 4: DNA fragment of HBV S gene from codon 146 to codon 226; Lane 5: HBY fragments; Lane 6: HB-SDY fragments; Lane M1: DNA marker.
