Results 121 to 130 of about 2,264,703 (172)
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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, Motomichi Sasaki
exaly +4 more sources
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, Motomichi Sasaki
exaly +4 more sources
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
exaly +4 more sources
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
exaly +4 more sources
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
exaly +4 more sources
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.
semanticscholar +6 more sources
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.
semanticscholar +6 more sources
Journal of Morphology, 2020
Abstract Amniote embryos are supported and nourished by a suite of tissues, the extraembryonic membranes, that provide vascular connections to the egg contents. Oviparous reptiles share a basic pattern of development inherited from a common ancestor; a vascular chorioallantoic membrane, functioning as a respiratory organ, contacts the
J. R. Stewart
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Abstract Amniote embryos are supported and nourished by a suite of tissues, the extraembryonic membranes, that provide vascular connections to the egg contents. Oviparous reptiles share a basic pattern of development inherited from a common ancestor; a vascular chorioallantoic membrane, functioning as a respiratory organ, contacts the
J. R. Stewart
openaire +4 more sources
Establishment of a rat placental cell line expressing characteristics of extraembryonic membranes
Developmental Biology, 1987A cell line was derived from midgestation chorioallantoic placental explants of the outbred Holtzman rat. The cell line was found to express characteristics of extraembryonic membranes and to grow when introduced into allogeneic hosts. Growth in allogeneic hosts was detected following intraperitoneal injection of the cells but not following ...
M J, Soares +5 more
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Radioautographic studies of DNA synthesis in the developing extraembryonic membranes of the mouse
The Anatomical Record, 1967AbstractTritiated thymidine was injected into pregnant BALB/c mice intravenously at 8, 10, 12, 14 and 16 days of pregnancy. Radioautographs were prepared in order to determine the extent of synthesis of DNA in the extraembryonic membranes at the above stages of gestation. The extent of synthesis of DNA was expressed as a radioactive index. The index is
Saccoman, F M, Morgan, C F, Wells, L J
openaire +3 more sources
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
openaire +4 more sources
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
openaire +4 more sources
Embryology of the sheep. I. Extraembryonic membranes and the development of body form
Journal of Morphology, 1972AbstractThe developmental anatomy of the sheep in the early prenatal period (14 to 34 days) was studied using embryos of known coital age, and embryos of known size with estimated coital age. Characteristics of the embryos were studied by gross observation under the dissecting microscope, and by means of serial sections.
M M, Bryden, H E, Evans, W, Binns
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Acta Biomaterialia
Extraembryonic tissues play a crucial role in embryonic development and fetal growth and exhibit remarkable biological and biomechanical properties including, pro-angiogenic, anti-inflammatory, immunomodulatory, anti-fibrotic, antimicrobial, and viscoelastic.
Gustavo Henrique Doná Rodrigues Almeida +13 more
openaire +3 more sources
Extraembryonic tissues play a crucial role in embryonic development and fetal growth and exhibit remarkable biological and biomechanical properties including, pro-angiogenic, anti-inflammatory, immunomodulatory, anti-fibrotic, antimicrobial, and viscoelastic.
Gustavo Henrique Doná Rodrigues Almeida +13 more
openaire +3 more sources