1. Young Arrowana should not have a yolk sac - and be seen feeding before purchase.

2. Even if the yolk sac is not visible, still be sure that is feeding before parting with your money.

3. The yolk sac is gradually vascularized.

4. The histologic findings showed metastatic yolk sac tumor.

5. The zebra pattern is fairly distinct, and the yolk sac begins to flatten out as it is absorbed.

6. The secondary yolk sac( YS ) is the first extraembryonic structure that can be detected with ultrasonography in the chorionic cavity.

7. The progresses in study on yolk sac hemopoiesis as well as the proliferation, differentiation and regulation of the YSHSC are reviewed in this paper.

8. Along with the yolk sac absorption, stomach and duodenum, were differentiated 3 days post hatch, respectively.

9. An endodermal sinus tumor (yolk sac tumor) of the testis is shown composed of primitive germ cells that form glomeruloid or embryonal-like structures.

10. By two months, the yolk sac becomes redundant and shrivels away.

11. Conclusion: Although the yolk sac tumor out of gonad have characteristics of malignant tumor by CT scanning, it is still lack of specificity, and need further physiological examination.

12. Results Methylmercury could pass through yolk sac placenta quickly, and inhibit placenta development and blood vessel differentiation there at higher concentration.

13. Methods The yolk sac in 129 pregnant women were measured by ultrasonography, and compared in normal and abnormal pregnancy group.

14. Objective To study the diagnosis and recognition of yolk sac tumor of testis.

15. Meckel's diverticulum is the rudiment of the embryonic yolk sac.

16. The results showed that more than80%of nutrition in yolk sac were utilized in59hours, which suggested that it was the main period of yolk sac utilization.

17. A modified method of extracting and purifying rickettsiae from infected chicken embryo yolk sac by differential centrifugations and Ether treatment.

18. Until about three months in the womb, baby sharks feed off a yolk sac.

19. Antibody to AFP has been shown to be useful in detecting hepatocellular carcinomas (HCC) and germ cell neoplasms, especially yolk sac tumors.

20. It concludes S. aureus L forms have teratogenicity , which may be a comprehensive effect on the visceral yolk sac function and embryos.

21. The gonads form from a group of large granulated yolk sac cells which invacle ridges.

22. The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges.http://

23. Methods: Retrospectively analyzed clinical manifestation and CT image of yolk sac tumor out of gonad in 6 cases.

24. I do not believe, however, that this is normal, since in the wild, young with such a large yolk sac probably would not survive without parental protection.