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Somatic polyploidy in extraembryonic membranes of the snake,Elaphe guttata [PDF]
Protoplasma, 1993 Video-densitometric DNA measurements of Feulgenstained tissues of 42 day old eggs of the corn snake,Elaphe g. guttata (Columbridae, Serpentes), revealed a basic DNA content of 2C=2.17 pg, with somatic polyploidy in the allantois, the chorioallontois, the yolk sac, and other extraembryonic membranes.
R. Meyer, Walter Nagl
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Immunohistology of clotting factor V in human extraembryonic membranes
Placenta, 1987Blood clotting Factor V was studied on fixed and unfixed cryostat sections of term human placentae, basal plates, amniochorions, and first-trimester placentae by using one- and two-colour immunofluorescence. A monoclonal antibody (GB36) which reacts with cytotrophoblast was used to identify cytotrophoblast.
W. Page Faulk +3 more
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Protein synthesis by chick (Gallus domesticus) extraembryonic membranes
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 19931. The protein synthesis in chorioallantoic membrane (CAM), amniotic membrane (AM) and yolk sac (YS) were studied by in vitro culture with 14C L-glutamic and immunoautoradiography. 2. The yolk sac synthesizes transferrin, alpha-fetoprotein (AFP) and serum albumin. These three proteins are also synthesized, but only in slight amounts, by AM.
Luis Sánchez Palazón +1 more
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Formation of the Placenta and Extraembryonic Membranes
Annals of the New York Academy of Sciences, 1998ABSTRACT: In eutherian mammals, the first cell types that are specified during embryogenesis are committed to form extraembryonic (placenta and fetal membranes) rather than embryonic structures. The trophoblast cell lineage, for example, forms at the morula‐to‐blastocyst transition: cells at the periphery of the morula become trophoblast, whereas ...
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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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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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Monotreme development with particular reference to the extraembryonic membranes
Journal of Experimental Zoology, 1993AbstractThis paper considers many of the salient features of monotreme development, particularly morphogenesis of the extraembryonic membranes.The uterine endometrium of both monotremes and marsupials exhibits a progesterone driven luteal phase where accelerated utilization of endometrial nutrients is evidenced by a rapid post‐primitive streak ...
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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 ...
Catherine S. Pinal +5 more
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Extraembryonic membrane development in a reproductively bimodal lizard, Lacerta (Zootoca) vivipara
Zoology, 2004Reproductive mode has been remarkably labile among squamate reptiles and the evolutionary transition from oviparity to viviparity commonly has been accompanied by a shift in the pattern of embryonic nutrition. Structural specializations for placental transfer of nutrients during intrauterine gestation are highly diverse and many features of the ...
Stewart, James R. +2 more
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