A question about pET system

Qingwu Shen via methods%40net.bio.net (by shenq from purdue.edu)
Thu Oct 23 15:17:22 EST 2008

Hi everybody,

I have a question about pET system. As you know, pET vectors do not have lacZ ¦Á-
peptide and are not applicable to blue/white screening. However, why the colonies 
still become blue on plate when XL1 blue transformed with pET28 basic vector is 
grown for more than 36 hours? Thank you very much.


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