Dr. Duncan Clark duncan at
Thu Oct 16 09:11:22 EST 1997

In article <3Q$lVHAWKgR0Ewme at>, "Dr. Duncan Clark"
<duncan at> writes
>It doesn't produce lacI ie pUC18 plated on Xgal (with no IPTG) gives
>blue clonies. 

I've had a look since posting and deltaU169, deltaX111 and deltaX74 are
deletions of the entire lac operon. DeltaX111 also deletes proAB as

Info on page 247 of NEB catalogue. 

The problem with being on the cutting edge is that you occasionally get 
sliced from time to time....

Duncan Clark
DNAmp Ltd.
TEl/FAX 01252376288

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