... kinase p90 Rsk Parthenogenesis Starfish oocytes The female gamete of most animals arrests in the meiotic cell cycle while awaiting fertilization, and thus parthenogenesis is prevented. Depending on the organism, this arrest occurs at the beginning of meiosis I, metaphase of meiosis I...

... to the metaphase. We show here that non-hormone-stimulated starfish oocytes, induced to mature by microinjection of MPF-containing cytosol taken from hormone-stimulated oocytes, produce normal bipin-naria larvae once fertilized. The same result was obtained when donor oocytes were induced to mature...