Figure 3From: Extraordinary diversity among members of the large gene family, 185/333, from the purple sea urchin, Strongylocentrotus purpuratusPhylogenetic tree of intron sequences. Intron sequences were aligned manually (Additional file 2). Maximum likelihood and maximum parsimony methods both produced unrooted tree shown. The five major clades were used to define the five intron types, as shown.Back to article page