The bacterium-derived DEAD-like helicase genes in coral are nested within bacterial sequences, whereas the upstream host-derived gene (encoding mannosyl-oligosaccharide 1,2-alpha-mannosidase IB) is monophyletic with homologous genes from other metazoan species. The downstream Acropora digitifera-specific gene has no detectable homolog in other species. Robust and complex corals are shown in brown and green text, respectively, and non-coral metazoan and choanoflagellate species are shown in blue text. Photosynthetic lineages, regardless of phylogenetic origin, are shown in magenta text and all other taxa are in black text. GenBank accession (GI) or other identifying numbers are shown for each sequence.