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Labeling tRNA genes according to the IUPAC-IUB single-letter amino acids: cox1, cox2 and cox3 present the three subunits of cytochrome c oxidase; cob present cytochrome b; nad1-nad6 constitutes NADH dehydrogenase; rrnL and rrnS refer to ribosomal RNAs. Genes named above the bar are located on major strand, while the others are located on minor strand. Anti-clockwise rRNA or PCGs genes are located on L strand and others are located on H strand.
