Stable Tandem Repeats?

Scott scj-13 at
Mon Aug 20 11:26:56 EST 2001

I'm looking for a way to stabilize tandem direct repeats in E. coli. In 
this case they're on a plasmid. When I prep it and perform restriction 
digests I see that I am losing copies of the repeat. The repeats are 
>500bp and there are several copies. I'm currently using NovaBlue as the 
host strain which is recA1. Novagen also sells another recA- strain, 
BLR, but I haven't tried it. Are there other commercial stains available 
with additional mutations which might prevent this from happening? I'd 
appreciate any suggestions you may have. Thanks.


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