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It appears that the stomach has an ancient origin. The stomach first appears in the fish lineage. The prevertebrate chordates do not have a true stomach, whereas the cartilaginous and bony fish do. Although most fish do have a true stomach, some fish species appear to have lost the stomach secondarily. The remaining vertebrate lineages do have a true stomach (at least in the adult animal), although there is great variation in the size and shape of the stomach.[well established][VHOG]
obo:source
DOI:10.1046/j.1525-142x.2000.00076.x Smith DM, Grasty RC, Theodosiou NA, Tabin CJ, Nascone-Yoder NM, Evolutionary relationships between the amphibian, avian, and mammalian stomachs. Evolution and development (2000) n8:
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2012-09-17
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VHOG:0000408
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VHOG