| species of tetrahymena identical by small subunit rrna gene sequences are discriminated by mitochondrial cytochrome c oxidase i gene sequences. | the mitochondrial cytochrome c oxidase 1 (co1) genes of two isolates of each of the seven mating types of tetrahymena thermophila were sequenced and found to differ by < 1% in nucleotide sequence and to be identical by putative protein sequence. as this gene was highly conserved in this species, the co1 gene sequence was determined for four pairs of tetrahymena species identical in their small subunit rrna gene sequences. the following pairs of species showed from 1% to 12% divergence at the nuc ... | 2006 | 16968457 |