In this letter Crick refers to genetic experiments undertaken with Leslie Barnett, Sydney Brenner, and Richard Watts-Tobin on acridine mutants, which indicated that the genetic code was a triplet code. Compelling evidence that poly-U (a synthetic form of RNA consisting of bases of a single type, uracil) coded for the amino acid phenylalanine was first presented by the American biochemist Marshall Nirenberg in the summer of 1961.
Number of Image Pages:
1 (55,983 Bytes)
Date:
1961-10-09 (October 9, 1961)
Creator:
Crick, Francis
Recipient:
Sinsheimer, Robert L.
Source:
Original Repository: Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers