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In his letter Crick relayed information on the base sequence for transfer RNA for valine, as well as his "latest blast" against Watson's manuscript for The Double Helix.. GTP stands for guanosine triphosphate, a precursor in the synthesis of ribonucleic acid.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 8. Folder: PP/CRI/D/1/1/4
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/