Figure 3.

SXRF scans (1 µm) of Ca, P, Zn and Sr distribution in acellular cementum (a–d), respectively, on the buccal aspect of the upper incisor root of Pongo (UCL-JS3-CA-28). Black arrow indicated the first highly mineralized layer of cementum at the CDJ. (e,f) Plots of SXRF Sr and Zn concentrations (ppm) are in the plane of the green bar (200 µm long) from the (CDJ) to the cementum surface (CS). There is poor correspondence between Zn and Sr levels. Zinc concentration at the cementum surface reached 2284 ppm, but were truncated above 450 ppm. (Online version in colour.)