http://www.eje.cz coding genes (PCGs): two ATPase genes (atp6 and atp8), three cytochrome c oxidase genes 1-3 (cox1-cox3), one cytochrome B (cob), seven NADH dehydrogenase genes (nad1-6 and nad4L), 22 transfer RNA (tRNA), two ribosomal RNA (rrnL and rrnS) genes; and a non-coding A+T-rich region (