(Phys.org) —A small team of international researchers has found that every type of jawed vertebrate they tested that has over time lost its stomach to evolution, such as chimaeras, numerous teleosts, lungfish and the platypus, also has the same missing genes. In their paper published in the journal Proceedings of the Royal Society B: Biological Sciences, the team describes their investigation into the genes of stomach-less vertebrates and it appears that they all lost the genes necessary for bringing them back should the need arise.
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