Host Cell

[Alan Gerstein]

Are any of you using an E. Coli with a lac mutation that deletes all the lacZ 
coding region while leaving the repressor and its promoter ? I don't want
any complemeting fragments left around.

Episomes or host chromosome deletions are both suitable, as well as lac IQ 
varients.
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You might want to contact the E. Coli bank at the Department of Human Genetics
at Yale Med. School.

Alan