This article offers a solution to the technical problems of a direct biochemical approach to deciphering the genetic code. Comparison of the nucleotide sequence of a gene with the amino acid sequence of its corresponding protein remained problematic as the sequence of nucleotides in each coding was initially unknown. The authors demonstrate with experimental evidence that there are only a certain number of possible nucleotides per code word. Additionally, by using tobacco mosaic virus RNA to direct the cell-free synthesis of a protein resembling TMV, the experiment suggests at least part of the genetic code appears to be universal.
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