Physical and genome map of the S. obliquus mtDNA. Genes, exons, and non-intronic ORFs are depicted as black blocks, introns are indicated as light-gray blocks, and intronic ORFs are shown as dark-gray blocks. Gene abbreviations are listed in Table . Gene blocks outside and inside the circle are transcribed in clockwise and counterclockwise directions, respectively. Transfer RNA genes are shown as thin black bars, with letters indicating amino acid specificity (see Table ), and numbers denoting different genes specific for the same amino acid. The anticodons (lowercase letters enclosed in parentheses) of the numbered tRNA genes are: I1, (uau); I2, (gau); L1, (cag); L2, (aag); L3, (caa); L4, (cua); R1, (acg); R2, (ccu); R3, (ucu); S1, (gcu); S2, (gga). Me and Mf denote the elongator and initiator trnM(cau), respectively.