Nucleotide alignment of cox1 exonic regions immediately flanking the intron insertion site. Taxa were chosen to represent the broad diversity of cox1 intron types/lineages known among angiosperms, with space constraints allowing only a small number of intron-lacking cox1 genes to be included. Among the latter genes, the Solanaceae are over-represented. Taxa are in phylogenetic order: brown, magnoliids; green, monocots; red, rosids; blue, superasterids. Plus (+) and minus (-) symbols in the 0 column indicate cox1 intron presence or absence, respectively. RNA editing sites are in red in the ancestral sequence. Sites diagnostic of extended co-conversion are in pinkish-brown (Solanoideae, Melia and Cynomorium), blue (Acanthaceae), green (Musaceae), and yellow (Brunfelsia jamaicensis). Vertical bars at far left indicate groups of taxa inferred to have acquired their introns by the same transfer event, with subsequent vertical transmission of the intron within each marked clade, whereas all non-marked intron-containing taxa are inferred to have acquired their introns via separate transfers (Barkman et al. 2007; Sanchez-Puerta et al. 2008).
Sanchez-Puerta et al. BMC Evolutionary Biology 2011 11:277 doi:10.1186/1471-2148-11-277