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Isotopes are nuclides with the same number of protons but differing numbers of neutrons; that is, they have the same atomic number and are therefore the same chemical element. Isotopes neighbor each other vertically, e.g., carbon-12, carbon-13, carbon-14 or oxygen-15, oxygen-16, oxygen-17.
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 which cannot be interpreted as a habitat change but due to the isotopic fractionation by O emission from the proteins.the chemical composition of the analytical areas ..
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