Results 141 to 150 of about 3,983 (179)
Ontogeny of the extraembryonic membranes of the oviparous lizard,Eumeces fasciatus (Squamata: Scincidae) [PDF]
Journal of Morphology, 2000 Oviposited eggs of Eumeces fasciatus contain embryos in the limb bud stage. Amniogenesis is complete and two yolk sac membranes, vascular trilaminar omphalopleure (choriovitelline membrane) and bilaminar omphalopleure, enclose the yolk vesicle. A small allantoic vesicle contacts the chorion.
Stewart, James R., Florian, James D.
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Paternal X chromosome expression in extraembryonic membranes of XO mice
The Journal of Experimental Zoology, 1979AbstractThe paternally derived allelic form of the X chromosome linked enzyme phosphoglycerate kinase (PGK‐1) is expressed in both the fetus and extraembryonic membranes of 9.5 day post coitum XO (XPO) mouse conceptuses. Previous studies on trophectoderm and primitive endoderm derived extraembryonic membranes in XX conceptuses suggest expression of ...
Verne M Chapman
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Nature, 1975
RANDOM X inactivation makes the female mammal a natural mosaic for clones of cells having either the maternally derived X (Xm) or paternally derived one (Xp) which is genetically inactive1. There are, however, instances in which inactivation is obviously not random2–7.
Nobuo Takagi +2 more
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RANDOM X inactivation makes the female mammal a natural mosaic for clones of cells having either the maternally derived X (Xm) or paternally derived one (Xp) which is genetically inactive1. There are, however, instances in which inactivation is obviously not random2–7.
Nobuo Takagi +2 more
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Placental development and expression of calcium transporting proteins in the extraembryonic membranes of a placentotrophic lizard [PDF]
Journal of Morphology, 2011 AbstractPseudemoia pagenstecheri is a viviparous Australian scincid lizard in which the maternal–embryonic placental interface is differentiated into structurally distinct regions. The chorioallantoic placenta contains an elliptical‐shaped region, the placentome, characterized by hypertrophied uterine and embryonic epithelial cells supported by dense ...
Stinnett, Haley K. +5 more
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The Journal of Experimental Zoology, 2003
AbstractAn understanding of the evolutionary morphology of extraembryonic membranes in reptiles requires information about oviparous as well as viviparous species. We are studying histology and ultrastructure of the extraembryonic membranes of snakes to clarify the evolutionary history of reptilian fetal membranes, including determination of basal ...
Daniel G Blackburn
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AbstractAn understanding of the evolutionary morphology of extraembryonic membranes in reptiles requires information about oviparous as well as viviparous species. We are studying histology and ultrastructure of the extraembryonic membranes of snakes to clarify the evolutionary history of reptilian fetal membranes, including determination of basal ...
Daniel G Blackburn
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Extraembryonic tissue in chelicerates: a review and outlook [PDF]
Philosophical Transactions of the Royal Society B: Biological Sciences, 2022 The formation of extraembryonic membranes (EEMs) contributes to the proper development of many animals. In arthropods, the formation and function of EEMs have been studied best in insects.
Nikola-Michael Prpic +1 more
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Antioxidative signalling pathways regulate the level of reactive oxygen species at the endometrial–extraembryonic membranes interface during early pregnancy [PDF]
International Journal of Biochemistry and Cell Biology, 2012 Conceptus (embryo and associated extraembryonic membranes) implantation and development require a reciprocal biochemical and physical interactions between the extraembryonic membranes and the endometrium.
Kais H Al-Gubory, Catherine Garrel
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Extraembryonic development in insects and the acrobatics of blastokinesis [PDF]
Developmental Biology, 2008 Extraembryonic development is familiar to mouse researchers, but the term is largely unknown among insect developmental geneticists. This is not surprising, as the model system Drosophila melanogaster has an extremely reduced extraembryonic component ...
Kristen A Panfilio
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Late extraembryonic morphogenesis and its zenRNAi-induced failure in the milkweed bug Oncopeltus fasciatus [PDF]
Developmental Biology, 2009 Many insects undergo katatrepsis, essential reorganization by the extraembryonic membranes that repositions the embryo. Knockdown of the zen gene by RNA interference (RNAi) prevents katatrepsis in the milkweed bug Oncopeltus fasciatus.
Kristen A Panfilio
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