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The phylogenetic tree of vertebrate Mstns was constructed using the Neighbor-Joining method with MEGA5. The percentage of replicate trees in which the associated genes clustered together in the bootstrap test (1000 replicates) is shown next to the branches. The Mstn protein sequences of different animals (scientific name shown in italic) were retrieved from the GenBank database (www.ncbi.nlm.nih.gov/) and the GenBank accession numbers are shown in brackets.
