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Comparison of the effect of four commercially available direct PCR kits on amplifying the VP28 gene in the presence of interfering hepatopancreatic lysates. (A) Control group: absence of hepatopancreatic lysate. (B) Analysis of direct PCR products in the presence of hepatopancreatic lysates. The PCR template was 250 copies of standard DNA plasmid. The number in the figure represents the peak area of the signal. N.D. means no detection.
