In innumerable spy movies, the hero or a villain imprints a key in clay in order to later make an exact copy. In the body, the clay is messenger RNA, or mRNA, which imprints a gene and transfers the plans to a ribosome, where the mRNA's code is manufactured into a protein - the shady shop where the clay imprint becomes a key.
URL: http://www.news-medical.net/news/20121011/NCI-identifies-method-by-which-cancerous-mRNA-escapes-the-bodys-safeguards.aspx
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