FIG. 1.

Gene maps of the sex-associated and hermaphroditic “F-like” mt genomes of freshwater mussels. Gene identities: complex I in green; complex III in light blue; complex IV in blue; complex V in light purple; small and large ribosomal RNAs (in purple). Transfer RNAs (in gray) are depicted by one letter amino acid codes. F-ORF, F-specific open reading frame (orange); H-ORF, Hermaphroditic-specific open reading frame (pink); M-ORF, M-specific open reading frame (red). Genes positioned inside the circle are encoded on the light strand, and genes outside the circle are encoded on the heavy strand.