Human Gene Expression
From WikiGenetics
A given gene is considered "expressed" when it is transcribed and turned into a protein product. Different organisms have varying ways of influencing when, how, and how often their DNA is transcribed, but there are a few major themes that most organisms share. There are regulatory regions of DNA that give directions as to how often a gene is to be expressed, and there are also quality control measures to ensure proper amounts of gene products are being made correctly.
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