THE YOLK SAC
Primitive and definitive erythropoiesis in the yolk sac: a bird’s eye view
... hematopoiesis, yolk sac Introduction Studies on chicken hematopoietic development have been instrumental in the establishment of several key concepts in the field, including B lymphocytes, hematopoietic ...
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Duck hepatitis B virus replicates in the yolk sac of developing embryos.
... We compared viral replication in the yolk sac tissue of DHBV- infected developing embryos to that in DHBV-infected de- veloping liver and found that viral replication in the yolk sac is [r] ...
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Human embryonic hemopoiesis Kinetics of progenitors and precursors underlying the yolk sac liver transition
... J Clin Invest. 1986;78(1):51-60. https://doi.org/10.1172/JCI112572. Human embryonic development involves transition from yolk sac (YS) to liver (L) hemopoiesis. We report the identification of pluripotent, ...
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A review on yolk sac utilization in poultry
... of yolk con- tents through the yolk stalk into the intestines takes place because this passage is prevented by a loop of tissue, which is probably the intestinal loop attached to the yolk stalk ...
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Yolk sac and its effects on fetal prognosis
... irregular yolk sac shape may be used to indicate an adverse gestational ...irregular yolk sac shape is unrelated to an increased risk of spontaneous ...calcified yolk sac may ...
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Equine Yolk Sac: A Stem Cells Source
... This study aimed to isolate and characterize equine YS mesenchymal stem cells and compare these with amniotic membranes. The yolk sac (YS) and amniotic membranes (AM) were obtained from 20 pregnant mares ...
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Vascular remodeling of the mouse yolk sac requires hemodynamic force
... and yolk sac by the 2- to 3-somite stage, indicating that patent vessels in the yolk sac are formed by the time the heart starts to ...
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THE CORRELATION OF SHAPE OF YOLK SAC WITH SPONTANEOUS ABORTION- AN ULTRASONOGRAPHIC STUDY
... cul-de sac. The gestational sac was looked for the presence of yolk sac and its ...shape. Yolk sac shape was observed. The yolk sac with wrinkled margins, indented ...
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Primary yolk sac tumor of the gluteus: a case report and literature review
... (Figure 2H). Discussion At present, the etiology of YSTs remains controversial. Most experts consider that YSTs may derive from the false migration of embryonic primitive pluripotent germ cells or oncogenesis of the ...
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The origin and fate of yolk sac hematopoiesis: application of chimera analyses to developmental studies
... mouse yolk sac contained hematopoietic progenitors that could be read out either by in vitro colony assays (Moore and Metcalf, 1970), or by the generation of day 10 spleen colonies using the method of Till ...
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Evaluation of the Therapeutic Potential of Canine Yolk Sac Cells in Dogs with Hips Dysplasia
... the yolk sac stem cell and are therefore a new source of easily obtained stem cells that induce a low immune response in the recipient animal and can be cultured and expanded in vitro without alteration of ...
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Prospective study in Predicting Pregnancy Outcome using Yolk Sac Parameters in First Trimester
... of yolk sac and its measurement and morphology is very important for assessing the normal pregnancy ...of yolk sac in ultrasound was reported in ...record yolk sac diameter and ...
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Yolk sac measurements and embryonic heart rate in predicting first trimester pregnancy outcome
... gestation or when the gestational sac reaches 10 mm in diameter. The SYS diameter increases slightly between 6 and 10 weeks’ gestation and then decreases. The comparison of ultrasound features with morphological ...
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The respiratory development of Atlantic salmon I Morphometry of gills, yolk sac and body surface
... Blaxter, 1986; Osse, 1989); to date, there are few physiological data available to test this hypothesis. Very large fish larvae, such as the salmonids, have circulating red cells at hatch, while smaller larvae often do ...
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The secondary human yolk sac has an immunophenotype indicative of both hepatic and intestinal differentiation
... human yolk sac (SHYS) is well known, few studies have addressed its immunohistochemical ...the yolk sac endoderm were reflected in a hybrid immunophenotype in which proteins characteristic of ...
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Novel methods for determining hematopoietic stem and progenitor cell emergence in the murine yolk sac
... the yolk sac demon- strated that cells originating in this extraembryonic structure contribute to not only primitive and definitive hematopoietic lin- eages, but also to fetal lymphoid progenitors and adult ...
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A study to assess predictive value of yolk sac diameter by transvaginal sonography with the pregnancy outcome
... The yolk sac is the first structure to appear in the gestational sac, which confirms an intra uterine ...pregnancy. Yolk sac measurement can be used as a tool to evaluate pregnancy ...
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The nuclear envelope protein MAN1 regulates TGFβ signaling and vasculogenesis in the embryonic yolk sac
... primitive plexus. The third embryo contained irregularly shaped blood vessels and had undergone embryonic axial rotation but was edematous and small compared to E9.5 wild-type embryos. No embryos were observed to develop ...
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Testicular yolk sac tumors in children: a review of 61 patients over 19 years
... the yolk sac tumors as solid ...of yolk sac tumor including microcapsule and reticular structures, gland tube-gland bubble structures, an embryo sinus structure, and papillary ...
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Determining Presence of Yolk Sac and Intestinal Bacterial Colonization in Pre-hatch Chicken Embryos
... Subsequent fertile eggs were collected for 14 days, then eggs were set for incubation. On days 13, 16, and 20 of incubation, three eggs for each time period were brought to the lab and sampled in the biosafety cabinet. ...
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