Fig. 9

This diagram summarizes how the ectoderm contraction wave moves across an axolotl embryo, as seen from the left side. It starts at a point that spreads to a circle (hour #1), breaking into an arc (hour #3) that moves over one hemisphere, finishing off (hour #10) as a circle that comes down to a point and vanishes. From [10] with permission of John Wiley and Sons. This figure is reproduced and discussed in [183]. This wave is a furrow 0.1 mm wide and deep on this 2 mm diameter embryo propagating around 3 μm/min