There are 20,000 genes in the human genome, but only a small fraction of them are active in any given cell. This video from Nature explains with beautiful clarity the system that activity, turning genes on and off. It's called the epigenome, and it's incredibly important. Now you can understand how it works, too.
via Gizmodo http://ift.tt/1EYFYIX http://ift.tt/1BrATLo
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