Analysis of the third and fourth cell cycles of mouse early development

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Authors:
R. K. W. Smith
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and
M. H. Johnson
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DOI:
https://doi.org/10.1530/jrf.0.0760393
Volume/Issue:
Volume 76: Issue 1
Page Range:
393–399
Article Type:
Research Article
Online Publication Date:
Jan 1986
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Summary. The third (4-cell) and fourth (8-cell) cell cycles of early mouse development have been analysed in populations of blastomeres synchronized to the preceding cleavage division. DNA content was measured microdensitometrically. The entry of blastomeres into these cell cycles showed considerable heterogeneity both within and between individual embryos. This heterogeneity was greater in the fourth than in the third cell cycle. The component phases of the third cell cycle were estimated as G, = 1 h, S = 7 h, and G2 + M = 2–5 h, and those of the fourth cell cycle as G1 = 2 h, S = 7 h, and G2 + M = 1–3 h.

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Print ISSN:
1470-1626
Online ISSN:
1741-7899