XL1-blue equiualent w/o tetR?

Yoram Gerchman via methods%40net.bio.net (by gerchman from research.haifa.ac.il)
Thu Aug 19 02:50:34 EST 2010

Greetings neters
Does anyone know what would be an E. coli XL1-blue equivalent but without the 
tetracycline resistance? Or what was XL1-Blue derived from?
Many thanks

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