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Howard Florey Institute, The University of Melbourne, Victoria 3010, Australia.
The relaxin-like peptide family consists of relaxin-1, relaxin-2, and relaxin-3 and the insulin-like peptides (INSL)-3, INSL4, INSL5, and INSL6 (human relaxin-2 is equivalent to relaxin-1 in other species). Evolution of this family has been contentious. We therefore sought to clarify the issue by performing phylogenetic analysis of all relaxin-like peptides from the genomic databases available. Surprisingly, the phylogeny, combined with previous biologic characterizations, suggest that although relaxin's original function was likely in the brain, its reproductive role was acquired just prior to the divergence of amphibians. This phylogeny also illuminates inconsistencies in relaxin evolution in invertebrates, chickens, and cows.
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