Figure 2From: Some novel intron positions in conserved Drosophila genes are caused by intron sliding or tandem duplicationApomorphic introns, mapped onto the Drosophila tree. Changed intron positions that could unambiguously be mapped onto a specific branch are denoted by circles. Filled circles indicate intron changes that occurred only once. Two empty circles indicate two independent slidings of a single ancient intron into the same derived position. The tree is scaled according to the DroSpeGe database [21].Back to article page