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RT-PCR amplification of polβ gene. Lanes 1, 2 and 7: Normal size of PCR products of H1, H2 and H3; lanes 3-6: shorter size of PCR product of H5, H8, H10, and H16; M: DNA marker (from top to bottom: 1 000, 900, 800, 700, 600, 500, 400, 300, 200, 100 bp).
