The lac Operon
Transcription of the lac operon is carefully regulated so that its expression only occurs when glucose is limited and lactose is present to serve as an alternative fuel source.
Source
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"OpenStax College, Prokaryotic Gene Regulation. October 16, 2013."
http://cnx.org/content/m44535/latest/Figure_16_02_03.png
OpenStax CNX
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