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Phylogenetic tree of NPCRY and PCRY orthologs, based on maximum likelihood analysis of conserved regions. The nudibranch NPCRY proteins were similar to other molluscs and shared more recent ancestry with orthologs in chordates than arthropods. Nudibranch PCRY proteins were also grouped with molluscs. Chordates do not have orthologs for PCRY. The tree was rooted on a CRY protein from the sponge Amphimedon queenslandica (Rivera et al., 2012).
