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What is the purpose of using IPTG and XGal in selective plates?

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What is the purpose of using IPTG and XGal in selective plates?

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  1. IPTG is chemically similar to lactose and causes the release of the Lac Operon repressor protein, which allows transcription of the lac operon. IPTG is not cleved by B-galactosidase.

    Lac Operon Info: http://en.wikipedia.org/wiki/Lac_operon

    Blue/White Selection Info: http://www.geocities.com/jsonnentag/igua...

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