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In this letter to biochemist and Nobel laureate Fritz Lipmann, Crick sought to establish priority for his and Sydney Brenner's ideas on the genetic code. He claimed to have conceived these ideas before Marshall Nirenberg described the results of his poly-U experiments using a cell-free system (the system Crick referred to in his letter) at the International Congress of Biochemistry, held in Moscow in August 1961. Nirenberg's experiment proved by biochemical methods that triplets of uracil (UUU) coded for the amino acid phenylalanine.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 10. Folder: PP/CRI/D/1/1/12
Rights:
Reproduced with permission of the Wellcome Library for the History and Understanding of Medicine. and http://library.wellcome.ac.uk/
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/