Figure 1. Gene map of Helicosporidium mtDNA.

Genes (filled boxes) located outside/inside the map are transcribed clockwise/counterclockwise. Introns are denoted by open boxes whereas intronic ORFs are illustrated as half-height boxes within the open boxes. tRNA genes are indicated by the one-letter amino acid code followed by the anticodon in parentheses (Me, elongator methionine; Mf, initiator methionine). ORFs smaller than 150 amino acids are not shown. Shared clusters between the Helicosporidium and Prototheca mitochondrial genomes are denoted by alterning black and gray brackets.