First Cleavage Division of the Mouse Zygote: An Ultrastructural Study1
نویسندگان
چکیده
منابع مشابه
Blastomeres arising from the first cleavage division have distinguishable fates in normal mouse development.
Two independent studies have recently suggested similar models in which the embryonic and abembryonic parts of the mouse blastocyst become separated already by the first cleavage division. However, no lineage tracing studies carried out so far on early embryos provide the support for such a hypothesis. Thus, to re-examine the fate of blastomeres of the two-cell mouse embryo, we have undertaken ...
متن کاملPhases of cytoplasmic and cortical reorganizations of the ascidian zygote between fertilization and first division.
Many eggs undergo reorganizations that localize determinants specifying the developmental axes and the differentiation of various cell types. In ascidians, fertilization triggers spectacular reorganizations that result in the formation and localization of distinct cytoplasmic domains that are inherited by early blastomeres that develop autonomously. By applying various imaging techniques to the...
متن کاملPositional relationship between the gamete fusion site and the first division plane in the rice zygote
In angiosperms, a zygote generally divides into a two-celled proembryo consisting of an apical and a basal cell that possess different cell fates. This first division of the zygote is a putative step in the formation of the apical-basal axis of the proembryo. The gamete fusion activates the egg, and the gamete fusion site on the zygote has been reported to provide a possible cue for subsequent ...
متن کاملCytoskeleton dynamics control the first asymmetric cell division in Arabidopsis zygote.
The asymmetric cell division of the zygote is the initial and crucial developmental step in most multicellular organisms. In flowering plants, whether zygote polarity is inherited from the preexisting organization in the egg cell or reestablished after fertilization has remained elusive. How dynamically the intracellular organization is generated during zygote polarization is also unknown. Here...
متن کاملTiming of the first cleavage division of haploid mouse eggs, and the duration of its component stages.
Mouse eggs were activated by treatment with hyaluronidase which removed the follicle cell9, followed by culture in vitro, and examined at the first cleavage mitosis. Second polar body extrusion usually occurred and haploid parthenogenesis was initiated. Air-dried chromosome preparations were made between 11 and 15-5 h after activation. Out of the 308 eggs examined 74 had already progressed to t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biology of Reproduction
سال: 1972
ISSN: 0006-3363,1529-7268
DOI: 10.1093/biolreprod/7.2.170