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Positive nested PCR result from hepatitis B surface-negative, core-positive serum samples of healthy volunteers. A 656 bp DNA product was amplified using primers specific for hepatitis B S-gene. All lanes show a PCR product of the expected size. LD: 100 bp molecular weight marker; PC: Positive control; and NTC: Non-template control (NTC). 160×161mm (72 × 72 DPI)
