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Embryos of live-bearing elasmobranchs (sharks, skates, and rays) must acquire oxygen in the uterus for several months to more than a year, but the mechanisms of delivery and uptake are still largely unknown. Diagnostic sonography performed on a captive Japanese dogfish (Squalus japonicus) showed that a late-stage embryo used buccal movement to pump uterine fluid, suggesting that the embryo acquires...
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