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(Left) The Jebel Irhoud 3 North African juvenile fossil human mandible showing the location of the incisor tooth enamel (white box) sampled with the synchrotron. (Middle) Close up of enamel fragment, with the area of interest (on right) shown in the white box. (Right) Synchrotron image showing growth lines (white arrows) with 10 daily lines between them (white brackets). The scale bar is 200 microns, or 0.2 mm.
Image credit: Tanya Smith (Harvard University), PNAS