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In this detailed letter, Crick described ongoing work in his laboratory, particularly on nonsense codons, triplet sequences that do not code for amino acids but for the termination of the polypeptide chain in protein synthesis.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 9. Folder: PP/CRI/D/1/1/11
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/