Answers are grounded in this paper and cite their sources.
Radioautographs of early neural tube of chick embryos treated with thymidine-H3 for varying intervals of time give evidence substantiating the concept of inter-kinetic migration of nuclei. Synthesis of DNA occurs only in nuclei of peripheral part of wall, and does not take place in those of juxta-luminal zone. The period of DNA synthesis continues for at least 4 hours, but does not extend much beyond this time.
No takes yet. Share an insight, caveat, or question.
Sauer et al. (1959) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: