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With PCR, RT–PCR, and direct sequencing, complete nucleotide sequences were established for the Elymus sibiricus mitochondrial cytochrome c oxidase subunit 3 gene (cox3) and its cDNA. The cox3 transcript was shown to have 12 editing sites with changes affecting the amino acid sequence of the protein product. The editing of the primary cox3 transcript was found to change the position of a site of protein–protein...