Fig.4 Gel electrophoresis of PCRs performed with purified or commercial Taq DNA polymerase. Lane 1, PCR reaction with Taq DNA polymerase isolated from E.coli (pTaq2). Lane 2, PCR reaction with commercial Taq polymerase. Lane 3, PCR reaction with E.coli (pControl) lysate. Lane 4, PCR reaction with commercial Taq polymerase but without template DNA. Lane 3 and lane 4 served as negative control. 1kb is the DNA molecular weight ladder.
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