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Phylogenetic analysis of the mature GRP peptides. Neighbor-joining tree constructed with MEGA3 demonstrating the taxon-specific clustering of mature GRP peptides and illustrating the bony fish-specific gene duplication event. Internal numbers are supporting values for the corresponding branch points (supporting values below 60% were omitted). *, fish species where only one GRP isoform was found, either GRP1 or GRP2.
