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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. 6 — a Contracting rings are found during formation of the amniotic sac (top left, anterior photo of an early day 3 chicken embryo in dorsal view) of the heart (bottom Left, anterior photo of a late day 2 chicken embryo in ventral view) of the head (top right, closure of the neural tube, photo of an early day 2 chicken embryo in frontal view), during formation of the hindgut (bottom right, posterior photo of a late day 3 chicken embryo in ventral view). b In vivo time-lapse video-microscopy of amniotic sac closure in chicken embryos (video 5). To the right, the temporal evolution of the hole diameter, showing a close to linear closure of the hole