Intact Genomics (ig) XL1 Blue Max chemically competent E. coli cells are suitable for high efficiency transformation in a wide variety of applications such as cloning and sub-cloning. These cells have the capability to allow for the preparation of high quality plasmid DNA, single strand rescue of phagemid DNA and blue/white screening. XL1 Blue Max cells provide superb transformation efficiency, significantly higher than any competitors similar product, allowing for increased opportunity for experimental success.ig XL1 Blue Max chemically competent cells have the following features: XL-1 Blue Max cells are tetracycline resistant. XL1-Blue Max cells are endonuclease (endA) deficient XL1-Blue Max cells recombination (recA) deficient, improving insert stability Cleavage of cloned DNA by the EcoK endonuclease system is prevented by the hsdR mutation. Blue-white color screening via the lacIq Z∆M15 gene on the F´ episome