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. 2018 Sep 12;4(9):eaat6925. doi: 10.1126/sciadv.aat6925

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Copyright © 2018 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. 3 — (A) Distal aspect of A. maximus tarsometatarsus (USNM A605208) from Christmas River (USNM A605208), showing five cut marks: three (TM-1 to TM-3) on the central trochlea (digit III), one (TM-4) on the medial trochlea (digit II), and one (TM-5) on the lateral trochlea (digit IV). (B) Cross section of TM-1 at ×30 magnification, illustrating depth using a topographic height color scale. Photo credit: V. R. Pérez, University of Massachusetts Amherst.