Fig. 3. Morphogenetic changes during development of the DM. (A,B) General CM-DiI labeling of embryo sections and highlighting of the dorsal somite at T0 (A) and the DM at T2 (B). (A',B') High magnifications of the medial domains of the images in A,B to illustrate the change in cell morphology between T0 and T2. Note reduced magnitude of cellular packing and of the number of nuclear layers in the apicobasal extent of the DM epithelium (T2) when compared with T0. (C,D) Changes in nuclear density (upper panels) and epithelial thickness (lower panels) along the mediolateral aspect of the epithelia as monitored between T0/T1 (C) and T1/T2 (D). Scale bar: 12 µm in A; 25 µm in B; 4 µm in A',B'.

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