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Several years ago it was observed (Barnett and Jacobson, 1964) that aminoacyl-RNA synthetase preparations from Neurospora crassa erroneously acylate with phenylalanine at least two Escherichia coli tRNAs other than the phenylalanine-specific tRNA. In addition, normal phenylalanyl-RNA is formed. Subsequently it was observed (Barnett, 1965; Imamoto et al., 1965) that two enzymes are involved in this interspecies acylation reaction. Data identifying the two E. coli tRNAs involved in the anomalous acylation will be presented.
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Barnett et al. (1966) studied this question.
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