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Hepatitis B viral virus X protein (HBx) fragments amplified by PCR from pAS2-1 recombinant plasmid and separated by gel electrophoresis (0.6% agarose). The different fragments have the expected molecular weights. Lane 1, 100-bp DNA ladder used as molecular weight marker; lane 2, full length (464 bp) HBx gene; lane 3, HBx X2 (352 bp) fragment; lane 4, negative controls; lanes 5–7, HBx X1 (216 bp) fragment.
