In this letter to the editor of Nature Crick outlined a theory of how the genetic code for proteins might have evolved through
incorporation of additional amino acids, followed by natural selection. Crick envisioned that the genetic code had undergone
three evolutionary stages, from a primitive to a final code.
Crick maintained a life-long interest in evolution and the origins of life, which he believed would have to be explained if
mankind was to develop a rational, scientific view of the world.
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14 January 1967
Periodical: Crick, Francis. "Origin of the Genetic Code" [Editorial letter]. Nature 213, ([14 January 1967]): 119. Article. Letter
(correspondence). 1 Image.
Nature Publishing Group
Reproduced with permission of the Nature Publishing Group.