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[Autoradiographic localization of RNA synthesis in vitro during oogenesis in Parascaris equorum].

Technical elaboration of in vitro incubation of Parascaris equorum gonads with 3H-Uridine has permitted, for the first time, the study of RNA synthesis during oogenesis along the whole gonadic tube. In germ cells, oocytes in diakinesis (oviduct) and in division of maturation (uterus) show no label. On the contrary oogonia and growing oocytes in ovary are labelled. RNA synthesis is always detected in all parietal cells but is more active in oviduct and uterus where the gonadic wall is particularly developed.