Fig. 4.

Bottom. Three-dimensional reconstruction of BMP4 gene expression in the right basilar papillae at E6.5 (A), E7 (B), and E9 (C), shown from a posteromedial view. Thefuchsia color in the medial portion of the basilar papilla represents the strong anterior BMP4-positive area. Theyellow and red colors represent the weak and the posterior BMP4-positive areas, respectively. Examples of tissues from these three regions are shown in Figure 5C for E6.5 and in 5E for E9. Orientation: D, dorsal; L, lateral. ed, Endolymphatic apparatus; la, lagena;s, macula sacculi. Scale bar, 100 μm.