Genomic structures around CW- orf307 and rpl5. (A) Large-scale genomic re-organization presumed to explain the evolution of the CW-orf307 region. Boxes of same colors indicate identical regions. (B) Schematic representation of the rpl5 locus in the CW-CMS mitochondrial genome. The A nucleotide in the TGA stop codon of partial rps2 inserted in the upstream region of rpl5 was equal to the A in the ATG start codon of rpl5. Thus, partial rps2 and rpl5 were not chimeric.