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PCR Amplifications of Beta-Actin (a), HPV16 E6 (b), and HPV18 E6 (c) Genes in Specimens. Lane M: 100-bp DNA ladder marker; lane NC: negative control; lanes 1-3: HPV16-negative, HPV18-positive specimens; lanes 4 and 5: HPV16 and 18-positive specimens; lanes 6: HPV16-positive, HPV18-negative specimen; lanes 7-9: HPV16 and 18-negative specimens; lane PC: positive control
