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Unformatted text preview: the mRNA that codes for either a specific amino acid or a control word). The genetic code was broken by Marshall Nirenberg and Heinrich Matthaei, a decade after Watson and Crick's work. Nirenberg discovered that RNA, regardless of its source organism, could initiate protein synthesis when combined with contents of broken E. coli cells. By adding poly-U to each of 20 test-tubes (each tube having a different "tagged" amino acid) Nirenberg and Matthaei were able to determine that the codon UUU (the only one in poly-U) coded for the amino acid phenylalanine....
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