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Fig. 1 Analysis of cell behaviors in wild-type embryos. (A-H) Cross sections through the anterior neuroepithelium of mGFP (green) and DAPI (blue) labeled embryos. Dorsal is towards the top in all panels; developmental stages are indicated in the upper right corner. C is a composite of multiple focal planes. All other panels are single frames. The insets in C and D are higher magnifications of the boxed in areas. s, superficial cells; d, deep cells; lat, lateral region; med, medial region. Double arrowheads indicate the angular orientation of cells, the dotted red line in C indicates the midline of the neural keel and the dotted white line in D outlines the neural keel. Scale bar: 20 μm.