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Acronym for "transfer RNA". Transfer RNAs are short ribonucleic acids (RNA). tRNAs generally consist of 73 to 95 nucleotides. tRNAs mediate the amino acid to be assigned to the corresponding codon on the mRNA during translation. Myositis patients with anti-PL-7 or anti-PL-12 antibodies show interstitial lung involvement in 90-100% of cases (see also tRNA synthetase antibodies).