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. 2019 Jan 9;5(1):eaau7126. doi: 10.1126/sciadv.aau7126

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Archaeological tooth from individual B78 showing attached dental calculus deposits before sampling. (B) View of blue particles embedded within a large piece of intact dental calculus, as well as a blue particle already freed from dental calculus. (C to I) Multiple blue particles observed following sonication of dental calculus. Note the frequent co-occurrence of associated colorless minerals. Images (B) to (I) are shown to the same scale, as indicated in (I). Credit: C. Warinner (A); M. Tromp and A. Radini (B to I).