Abstract
The maturation process of starfish and Xenopus oocyte are described in detail. For the former, the role of 1‐methyl adenine is recalled, together with that the dissociation of a G protein into its alpha, beta and gamma subunits of and the role of the M‐phase promoting factor (MPF). The detailed roles of gonadostimule and of 1‐methyladenine are described, as it is that of the following steps, i.e. that of the product of the radial nerve, which stimulates 1‐methyladenine excretion. As for Xenopus, the mechanism of MPF activation by progesterone is described.. This brings to the translation of the messenger for the protein Pp39mos, which activates a MAPK pathway. The mechanism of the second arrest at metaphase II, because of the effect of the cytostatic factor involving the action of the proteins XErp1/Emi2, Plx1 and Cam II, is also described in detail.
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