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In this letter Khorana reported results for elucidating the genetic code he obtained by using intricate biochemical methods to make long strands of RNA with predetermined, simple, repeating sequences such as UCUCUCU . . . , which he found coded for a polypeptide consisting of serine-leucine-serine-leucine, etc.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/