Fig. 3.

Collapsed tree of full-length CR1s and presence of full-length copies of CR1 families in selected avian orders. The name of each family is taken from a previously described CR1 present within the family (supplementary table 3, Supplementary Material online). The coloring of squares indicates the presence of full-length CR1s within the order. All orders shown were chosen due to the presence of high numbers of intact CR1 elements, except for Casuariiformes which are shown due to their recent divergence from Apterygiformes as well as Passeriformes due to their species richness and frequent use as model species (especially zebra finch). The full CR1 tree was constructed using FastTree from a MAFFT alignment of the nucleotide sequences. For the full tree and nucleotide alignment of 1,278 CR1s, see supplementary figure 1 and data 2, Supplementary Material online.