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. 2015 Jan 19;370(1660):20130376. doi: 10.1098/rstb.2013.0376

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Backscattered scanning electron microscopy image of archaeological dental calculus in situ on the labial surface of a mandibular incisor. (a) Dental pulp cavity; (b) taphonomically altered dentine; (c) intact dentine; (d) enamel; (e) detail of dental calculus mineral layers and an in situ microfossil inclusion of biogenic silica (arrow); (f) detail of oral bacteria within dental calculus. The specimen shown is from Dalheim, Germany, and has been radiocarbon dated to 1079 ± 51 CE (calibrated) [39].