Fig. 2

SCN1B is present in birds. SCN1B (red) is missing from taeGut1 but present in the zebra finch PacBio assembly. The different orientations (arrows point in 5′ to 3′ direction) and relative positions of BCL3, PSMC4, and RBM42 across birds suggest multiple rearrangement events in the avian phylogeny, even within different songbird lineages. GRAMD1A was not found in any avian species. Arrowheads indicate gene orientation; solid lines indicate gap-less intergenic regions; dotted lines indicate intergenic regions containing gaps; broken lines indicate interspersed genes not shown; brackets indicate the ends of scaffolds in the respective assemblies