Figure 4: Scanning electron microscopy of fractured incisors from 16-week-old wild type and amelogenin null mice. The enamel (E) and junction with dentin (D) are shown. (a) wild type mouse. (b) the enamel from the Amelx null mouse does not have a normal prismatic structure and is markedly reduced in thickness compared with that of the wild type mouse shown at the same magnification as (a). (c) higher magnification of the enamel layer from the null mouse. Arrowheads indicate enamel thickness. Bars in (a) and (b) μm; bar in (c) μm. This figure was originally published in: Gibson et al J. Biol. Chem. 267 (34):31871-31875, 2001. The American Society for Biochemistry and Molecular Biology. DOI 10.1074/jbc.M104624200.