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. 2017 Jun 16;8:405. doi: 10.3389/fphys.2017.00405

Figure 1.

Figure 1

(A) TEM freeze etched enamel showing repeated globular structures ~30–50 nM dia in linear arrays (rat incisor) (Robinson et al., 1981) (bar = 60 nM). (B) AFM tapping mode in air of maturation stage enamel crystal showing repeated contiguous globular subunits ~30 nM diameter (rat incisor, tapping mode in air) (Kirkham et al., 2000; Robinson et al., 2004) arrows (bar = 30 nM).(C). AFM image of polished section of mature human enamel. Cross sections of enamel crystals are visible showing ~15 nM subunits in roughly hexagonal clusters (tapping mode in air) (Robinson et al., 2004) arrows (bar = 60 nM). (D) AFM image of polished section of mature human enamel. Longitudinal sections of enamel crystals are visible showing 15nm subunits, (human, tapping mode in air) longitudinal interface between subunits can be seen arrows (Robinson et al., 2004) (bar = 60 nM). (E) High resolution TEM image of freeze etched rat incisor secretory enamel showing 30–50 nM globules but comprising smaller ~15 nM subunits, arrows.