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Nature 1989 Nov 30;3426249:512-8. doi: 10.1038/342512a0.
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The c-mos proto-oncogene product is a cytostatic factor responsible for meiotic arrest in vertebrate eggs.

Sagata N , Watanabe N , Vande Woude GF , Ikawa Y .

The c-mos proto-oncogene product, pp39mos, is present in unfertilized Xenopus eggs, and disappears on fertilization. Microinjection of synthetic mos RNA into two-cell embryos induces cleavage arrest at metaphase. By contrast, egg cytosol extracts, when immunodepleted of endogenous pp39mos, lose their cleavage-arresting activity in injected embryos. These results demonstrate that Mos protein is the cytostatic factor CSF, long known as an endogenous meiotic inhibitor in vertebrate eggs.

PubMed ID: 2531292
Article link: Nature

Species referenced: Xenopus laevis
Genes referenced: mos

References :
Hunt, Embryology. Under arrest in the cell cycle. 1990, Pubmed, Xenbase