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Agarose gel electrophoresis of PCR products. A: amplification of fragment of β-globin: M: 100 bp DNA marker, lanes 1-7: positive samples, lanes 8-10: negative samples, lane 11; positive control, lane 12; Negative control. B: amplification of fragment of EBV EBNA-1 gene: M: 100 bp DNA marker, lanes 1-7: positive samples, lane 8: positive control, lane 9: negative control
