Reconstitution of intron gain and loss events mapped on a species tree. Branch lengths are proportional to time, the time scale in million years is shown below. Numbers along the branches are intron positions. HGT: horizontal transfer event. Black numbers: intron gains; red numbers: intron losses in all gene copies in a clade; green numbers: intron loss in some, but not all gene copies in a clade; blue numbers: intron gains specific to Stehi1|78757|. Black crosses show complete gene losses.
Da Lage et al. BMC Evolutionary Biology 2013 13:40 doi:10.1186/1471-2148-13-40