pUCPCR1

The mutiple cloning site of pUC19 was replaced by a multiple cloning site possessing a double Xcm1 restriction site. Digestion withXcmI gives a linear vector with a single 3′-overhanging T-residue at both ends. This provides the easiest way of creating a vector in which PCR fragments produced byTaq polymerase can be directly cloned without further modifications.