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T-Vectors pMD20 and pMD19 for PCR cloning

T-Vector pMD20 is a linearized vector with a single 3'-terminal thymidine at both ends. The T-overhang ends at the cloning site improves the efficiency of ligation of PCR products which contain A-overhangs at 3'-ends. T-Vector pMD20 is derived from a pUC19 backbone with modifications in the coding sequence to reduce the false positive rate and improve the positive colonies screened by blue/white color on ampicillin/IPTG/X-Gal LB plates.
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