E. coli is indeed the coolest thing on the planet - Carl Zimmer
XL-1Blue MRF'
From EcoliWiki
Alternate Names 
Sources 
Chromosomal Genotype 
Δ((mcrA)183Δ(mcrCB-hsdSMR-mrr)173 recA1 endA1 gyrA96 thi-1 hsdR17 supE44 relA1 lac
Plasmids 
Phage 
F´ proAB lacIqZ∆M15 Tn10 Tetr
Phenotypes 
Construction 
Notes
This strain was created to allow high-efficiency and representational cloning of methlyated DNA. All known K-12 restriction modification systems have been deleted.
References
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