Figure 13. (a) A chloroquine-treated and MGA-stained rat incisor near the dentino-enamel junction. Tomes' processes remnants (asterisk) and some electron-dense amorphous material in dentin are MGA-positive. (b) Obtained after the same pharmacological treatment, but the section is stained by the IP reaction. Some crystal-like proteinaceous structures are stained, with or without demineralization of the sections, suggesting that some phospholipids are actually present in extracellular matrix. Dentin is unstained. x81,000.