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By Dr. Greg Freyer (coauthor of DNA Science: A First Course2nd Edition, item# 212209) exclusively for Carolina. Plasmid contains gene for ampicillin resistance and the entire ß-galactosidase gene. It doesn't depend on complementing a partial ß-galactosidase gene product as does pUC. The host, E. coli DH5, doesn't need to be maintained on minimal medium for pBLU® transformation. The lac suppressor gene is inactivated, eliminating need for IPTG in the medium.