Fig 1. Gene organization of Beta vulgaris CMS-associated genes and their orthologues in normal fertile- (N), Owen- (Owen), E- (E), and G-type (G) mitochondria.

Boxes identify coding regions. atp6 and cox1 are genes encoding a subunit of F0 ATPase and a subunit of cytochrome c oxidase, respectively. The direction of transcription is from left to right. Red- and yellow-colored regions identify NH₂-extensions of atp6 and cox1, respectively. Names of the NH₂-extensions are shown near the colored boxes. orf129 is unique to E-type mitochondria, and no homologous sequences are found from other mitochondria. A scale bar is shown in the lower right corner.