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Constrained molecular phylogenies for vertebrate arrestins, in collapsed form; the lamprey Arr-VY sequence has been included. Both panels represent constraints that are consistent with 2R genome duplication, followed by A–J speciation. (a) With no constraint on jawed vertebrate Arr-B2. (b) With jawed vertebrate Arr-B2 also constrained. Both trees passed all three tests of topology, with p-AU = 0.25 (a) and 0.18 (b).
