This strain is the most popular for blue/white screening. It is also
an excellent host strain for routine cloning application using plasmid
or lambda vectors. XL1-Blue cells are tetracycline resistant. XL1-Blue
cells are endonuclease (endA) deficient, which greatly improve the
quality of miniprep DNA, and are recombination (recA) deficient,
improving insert stability. The hsdR mutation prevents the cleavage of
cloned DNA by the EcoK endonuclease system. The lacIqZΔM15 gene on the
F´ episome allows blue-white color screening.
ECOS Blue Competent Cells are chemically competent and have been
developed using a novel chemical preparation. ECOS technology makes the
cell highly efficient for DNA uptake.
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