Bacterial Strains
It is important to include your bacterial genotypes in your methods. Genotypes list only the genes that are mutated in the bacterial strains. These mutations have been intentionally incorporated for various reasons. Descriptions of the mutations are given in the second table.
The following is taken from:
Promega Protocols and Applications Guide. Second Edition. Copyright 1991. Promega Corporation. Madison, WI.
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More info on bacterial strains commonly used in recombinant DNA production. This article discusses why you sometimes need IPTG and sometimes you don't.