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Tags: 2012, Behringer R R, Cooper L N, Evo-devo, hox genes, Journal Article, Journal of Vertebrate Paleontology, natural-selection, pachyrhachis-problematicus, Paleontology, pelvic reduction, phylogenetic-relationships, programmed cell-death, sonic-hedgehog expression, Thewissen J G M, threespine stickleback, wing digits
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