and 2Newoendocrinologie des Znsectes, CNRS UA 669, Universitt! P. and M. Curie, 12, rue Cuvier, 75252 Paris Ckdex 05, FranceThe regulation of ovulation and parturition, in the viviparous tsetse flies, constitutes a very pncisely adjusted mechanism. Indeed the process of vitekgenesis takes places, in one oocyte only, during the incubation period when the larva is nourished in utero on milk produced by the mother. Neuropeptides, biogenic amines, neurotransmitters as well as ecdysone, and 20-hydroxyecdysone and also nervous outputs regulate ovulation and pturition A model is proposed for the mechanisms controlling these processes.
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