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The regulatory machinery works when | The regulatory machinery works when [[Proteins]] called transcription factors bind to specific short sequences of DNA that flank the gene, called transcription factor binding sites, and by doing so, switch genes on and off.<ref>[http://news.cornell.edu/stories/2013/06/genetic-switches-play-big-role-human-evolution Genetic switches play big role in human evolution]</ref> | ||
==Natural Light is a Link to Genetic Expression== | ==Natural Light is a Link to Genetic Expression== |