Collagen was extracted and analyzed for bulk stable isotopes of carbon-13 (δ 13 C) and nitrogen-15 (δ 15 N) and compound-specific isotopes of individual amino acids. Radiocarbon dating provided ...
The results were published in the Proceedings of the National Academy of Sciences (PNAS). The researchers analysed oxygen isotopes from 14 samples from the Moon and carried out 191 measurements on ...
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