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In his response Crick noted the surprisingly frequent appearance of palindromes in Khorana's tyrosine tRNA sequence data, that is, of DNA sequences that read the same in both directions.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 12. Folder: PP/CRI/D/1/2/6
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/