On Degenerate Templates and the Adaptor Hypothesis: A Note for the RNA Tie Club

In this, one of the most important unpublished articles in the history of science, Crick predicted the existence of adaptor molecules and enzymes for each of the twenty common amino acids. These adaptors, which were in fact found shortly thereafter and were later named transfer RNA, were essential in assembling amino acids into the polypeptide chains of which proteins consist. Moreover, Crick here introduced the concept of a "degenerate" genetic code, meaning a code in which more than one combination of DNA bases could specify a particular amino acid, as was later shown to be the case.