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Distribution of CcoA, aa3-Cox, and cbb3-Cox homologues among the alphaproteobacterial genomes analyzed. Note that 44 genomes have no CcoA, aa3-Cox, or cbb3-Cox homologues, whereas 115 have all of them. Of the genomes that have no CcoA, 68 have both aa3-Cox or cbb3-Cox, while 84 have only aa3-Cox and 6 have only cbb3-Cox. Note that of the CcoA-containing genomes, only three have only cbb3-Cox and seven have only aa3-Cox.
