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. 2022 Apr 8;45(4):31. doi: 10.1140/epje/s10189-022-00184-4

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© The Author(s) 2022, corrected publication 2022

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Fig. 10 — a In vivo time-lapse imaging of chicken flexure during the ventral pull, showing how the head part flexes ventrally (from Video 15). The movie shows the contraction of the cardiac crescent, and the forward flexure of the head. $DV = Dorso-Ventral$ boundary; YS $=$ Yolk Sac; A $=$ Anterior; P $=$ Posterior; CNS $=$ Central Nervous System; S $=$ Somites; CC $=$ Cardiac Crescent b Example of pattern built with a “mouth generating” contraction, an “ear generating” contraction and a “ventral” contraction (Video 16)