Phylogenomic analyses of all species of swordtail fishes (genus Xiphophorus) show that hybridization preceded speciation by Kang Du, Juliana Morena Bonita Ricci, Yuan Lu, Mateo Garcia-Olazabal, Ronald B. Walter, Wesley C. Warren, Tristram O. Dodge, Molly Schumer, Hyun Park, Axel Meyer, Manfred Schartl

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