Phylogeny of HOTAIR. (A) A tree built with concatenated sequences of orthologues of exon1, exon3, exon4 and exon5. (B) A tree built with sequences of exon6 orthologues. C1 indicates the first local clock, while C2a, C2b and C2c indicate the second local clock inserted at three different places in different computations.
He et al. BMC Evolutionary Biology 2011 11:102 doi:10.1186/1471-2148-11-102