The meaning of this observation is unclear, but it raises the unfortunate possibility of ambiguous triplets; that is, triplets which may code more than one amino acid. However one would certainly expect such triplets to be in a minority.
Francis Crick
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A final proof of our ideas can only be obtained by detailed studies on the alterations produced in the amino acid sequence of a protein by mutations of the type discussed here.
- Francis Crick -
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It seems likely that most if not all the genetic information in any organism is carried by nucleic acid – usually by DNA, although cetain small viruses use RNA as their genetic material.
- Francis Crick