Figure 1.

Mitochondrial gene map of the cephalopod mollusk Nautilus macromphalus. Genes for proteins and rRNAs are shown with standard abbreviations with an arrow indicating the direction of transcription. Genes for tRNAs are designated by a single letter for the corresponding amino acid, with the two leucine and two serine tRNAs differentiated by numeral (S1, S2, L1, and L2 recognizing codons AGN, UCN, CUN, and UUR, respectively). tRNA genes shown outside the circle are transcribed clockwise and those inside the circle are transcribed counter-clockwise. The largest non-coding region is designated "nc".