ESTs matching to the nad1 gene, and nad1 ESTs with a polyA stretch corresponding to the polyA tail of the mature nad1 transcript.

aESTs publicly available at 20 Feb, 2012.bESTs with a terminal polyA stretch >10 bp, mapping to the end of nad1. Polyadenylated ESTs mapping well inside the nad1 gene have not been considered, as they are mostly cDNA artefacts originated from the annealing of the oligo-dT primer to an A-rich inner gene region during the cDNA first strand synthesis.caccession number of the mt genomic sequence, if available. “Congeneric” means that only the sequence of a congeneric species is available, as reported in Table S1.