Oogenesis stages

Dyson 1999). Oogenesis in the absence of RBF1 appears to be normal as does the embryonic proliferation. In the case of the embryonic epidermis, cells are also known to exit from the cell cycle at the appropriate developmental stage. But some cells have problems maintaining quiescence. They turn on cyclin E expression, they progress through another S phase, but they do not seem to complete this extra cell cycle with a division. 

Dumont JN. 1972. Oogenesis in Xenopus laevis (Daudin). I. Stages of oocyte development in laboratory maintained animals. J Morphol 136 153. 

PSGP of high sialic acid content produced at later stages of oogenesis with glycan... 

Kdn-gp appeared to be synthesized during relatively later stages of oogenesis, since it was undetectable in the oocyte 3 months prior to ovulation. Although the cell types that synthesize Kdn-gp have not been identified, it is most likely synthesized under hormonal control in some extraoocj e cells (i.e. follicle cells), secreted and partly incorporated into the second outermost layer of the vitelline envelope just before ovulation. Kdn-gp may thus be a molecule homologous to the oviduct glycoproteins of mammals that are reported to be secreted and partly incorporated into the egg surface [58-60]. 

In Drosophila syncytial embryos, morphogens are used at several stages to induce different cell types along both axes. Asymmetries created in the fly egg during oogenesis trigger events that determine both the dorsoventral and the anterioposterior axes in fly embryos. 

King, R. C. (1957), Oogenesis in adult Drosophila melanogaster. II. Stage distribution as a fimction of age. Growth 21, 95-102. 

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