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Gill arches |
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| Their gill arches were slit and they were thrown into the next bin, where they twitched and gasped, slowly bleeding to death. There was also staining in the endothelium of vessels in the gill arches of the DR fish. Approximately 460 million years ago, the anterior gill arches of some aquatic vertebrates evolved into jaws and their supporting structures, including the hyomandibular bone. |
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