title: Description of the fully mature oocyte of Drosophila melanogaster.
abstract: We detected fully mature undescribed oocytes in Drosophila melanogaster ovaries. The fully mature oocytes were rehydrate in ovaries. In the oocyte of stage 14, chromosomes make globular mass, while the chromosome shows meiotic metaphase I in fully mature oocytes. Both mature oocytes and stage 14 oocytes were activated by hypotonic treatment. When the mature oocytes or the stage 14 oocytes were activated, telophase II figures were observed in former oocytes but meiosis in latter oocyte stopped at late metaphase I, suggesting the stage 14 activated oocyte cannot pass the second checkpoint of meiosis.
authors.affiliation: Faculty of Life and Environmental Science, Shimane University, Matsue city, Japan. sawamati@life.shimane-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Hatsumi
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Sawa
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000502:physiology; D003681:Dehydration / Q000196:embryology; D004331:Drosophila melanogaster / Q000502:physiology*; D005260:Female; D005440:Fluid Therapy; D008540:Meiosis / Q000502:physiology; D009865:Oocytes / Q000502:physiology*; D009866:Oogenesis / Q000502:physiology*; D010053:Ovary / Q000502:physiology; D010060:Ovulation / Q000502:physiology