This article discusses the state of the field approximately a year after Nirenberg's groundbreaking poly-U experiments were discussed in Moscow and the Proceedings of the National Academy of Science. The article addresses the efficiency and specificity with which synthetic polynucleotides have been found to direct amino acids into proteins, the process by which coding amino acids takes place, and the problem of degeneracy and its relationship to the general nature of the code. This article covers the same subject in "Qualitative Survey of RNA Codewords," which is also available on this site.
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