Figure 3.

The maximum-likelihood phylogenetic tree for the current data set of Anthozoan GFP-like proteins. Numbers at nodes denote the quartet-puzzling support values (1,000 puzzling attempts). Proteins from Alcyonaria subclass, which are considered outgroups, are labeled in white on black. The “stem” of the tree (thick gray line), joining two rooting groups, putatively reflects the diversity of GFP-like proteins before the separation of Alcyonaria and Zoantharia subclasses. Gray bars marked A–D denote the four distinct clades of GFP-like proteins found in Zoantharia. [Bar = 0.1 replacements/site.]