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Lower incisors of adult control, Spry4−/− and Spry4−/−; Spry2+/− mice. Dentin (red) is stained with azocarmine G, whereas the enamel is white (unstained). Note the labial and lingual layer of enamel in Spry4−/−; Spry2+/− incisors and the hypoplastic incisor of Spry4−/− animals. Dashed line (A) indicates the measured length reported in Table 3.
