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. 2015 Nov 30;4(12):1772–1781. doi: 10.1242/bio.013391

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© 2015. Published by The Company of Biologists Ltd

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Fig. 4. — Estimation of cell cycle length during Xenopus development. (A) Protocols used for estimation of cell cycle length by dual pulse S-phase labelling. Different strategies have been used for stages corresponding to primary neurogenesis (NF14, n=13), progenitor amplification phase (NF35, n=9), prometamorphosis (NF50, n=5), and secondary neurogenesis during metamorphosis (NF54, n=5). (B) Total cell cycle length (Tc) and (C) S-phase length (Ts) at corresponding stages. Both Ts and Tc are increasing during development in a manner that seems independent of the neural progenitors behaviour. (D) Cell cycle length of the dorsal part versus the ventral part of the spinal cord at NF54. The overall cell cycle at this stage is 35 h represent a composite of a heterogeneous population of Sox3 progenitors where dorsal progenitors cycle faster (25 h) than the ventral ones (80 h). Data represented as mean±s.e.m. ***P<0.001, **P<0.01, *P<0.05.