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Most embryo sacs degenerated, and only about 4.5% of the ovules contained a normal embryo sac with an egg cell, two synergids, three antipodal, and a central cell containing two polar nuclei.
      
Reserve nutrients were accumulated by the musculocutaneous sac elements at the procercoid stage and, later, by the glandular and tegumental cells.
      
New data have been considered concerning the previously unknown intraembryonic hemopoietic organ in mammals, a region of aorta-gonad-mesonephros arising in embryogenesis simultaneously with the yolk sac.
      
Cytophotometric measurements of Feulgen-DNA were carried out in the nuclei of embryo sac cells of Haemanthus albiflos and Ornithogalum caudatum.
      
Formation of nonreduced gametes in the embryo sac was induced by low temperature (4-7°C).
      
Spermatozoa penetrate the embryo sac as a cell, which increases aminopeptidase activity.
      
A polymorphism of the total protein (MY) and nonspecific esterase (EST) patterns was revealed in the musculocutaneous sac of earthworm Lumbricus rubellus by polyacrylamide gel electrophoresis.
      
The results suggest a role for TF in embryonic blood vessel development and maintenance of vascular integrity in the yolk sac.
      
In contrast to other Tylenchia, the musculocutaneous sac did not develop inMacroposthonia spp.
      
The Role of the Yolk Sac in Copper Metabolism during Rat Embryogenesis
      
Concomitantly, yolk sac cells produce ceruloplasmin, a soluble copper-transporting glycoprotein, a proportion of which in secreted proteins progressively diminishes, attaining 5.2% at day 11 and 3.1% at day 20 of development.
      
At different stages of embryogenesis, yolk sac cells synthesize two molecular forms of [14C]-ceruloplasmin, one of which is secreted towards the embryo, whereas the other, towards the decidual membrane.
      
The role of the yolk sac as a key organ controlling the delivery and secretion of copper in the embryo during the postimplantation period is discussed.
      
When the first Aat-1 expression was timed to later stages (yolk sac resorption), the parental alleles were activated synchronously (bream × roach, roach × bream, and roach × blue bream hybrids).
      
Morphogenesis of the sexual and adventive embryos proceeds in the mother organism and is determined by the origin and formation of their initials, types of ovule and embryo sac, and specific features of developmental biology.
      
The variants for overcoming the effect of imprinted signal in apomicts and plants with a tetrasporic embryo sac are considered.
      
The neural gland is located in the proximal portion of the mediodorsal blood vessel of the branchial sac.
      
In the major typhlosole and crystalline style sac of the direct loop, both basi- and subepithelial NO-ergic plexuses are less developed.
      
The larval development of the European smelt Osmerus eperlanus eperlanus from hatching to full resorption of the vitelline sac has been described.
      
Wheat ovaries were studied at the following developmental stages: the mature embryo sac with eight nuclei (stage 1), the interphasic zygote 12 h and 24 h after fertilization (stage 2), and the onset of zygote division (stage 3).
      
 

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