Figure 2

Whole embryo strain rate maps during morphogenesis. (A) Diagram of the spherical embryonic surface discretized as a mesh defined by nodes and domains for computing the strain-map. (B) The orthogonal components of strain along (A-P) and M-L directions. Expansion (red) and compaction (blue) of domains are shown oriented along A-P and M-L axis. For simplicity, strain in radial direction was not shown here. The strain here and the rest of the study are obtained from strain rate integrated over a 30-min interval centred at the indicated time point. (C) Experimentally derived strain-maps along Medio-lateral (M-L) and Anterior–posterior (A-P) directions. Dorsal and ventral views of strain maps along M-L and A-P directions at five developmental stages. The embryo is oriented with anterior and posterior at the top and bottom respectively. Expansion state in both side of the dorsal line at 10:30 hpf, is marked with “*” symbol.