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The proportion of amino acids selected per region in RXFP1/2 and RXFP3/4 receptor genes that showed evidence of positive selection in mammalian or teleost lineages according to the branch-site test of positive selection. LDLa—low-density lipoprotein module A, LRR—leucine rich repeat, TM—transmembrane domain, ICL—intracellular loop, and ECL—extracellular loop.
