Yolk sac carcinoma derived from the rat epiblast as a renal isograft.

We report the novel observation that a biphasic, parieto-visceral (PYS/VYS) yolk sac carcinoma can develop from the isolated epiblast of the pre-primitive streak rat embryo in a prolonged cultivation in vivo as a renal isograft. Late 7-day rat egg cylinders were dissected free of the ectoplacental cone and the Reichert's membrane. The middle segment of the cylinder, in which the embryonic and the extraembryonic cell layers partly overlap, were also removed.

Comparison of glycosylation patterns of placental proteins between normal pregnancy and missed abortion.

Contemporary understanding of missed abortion, as the case of spontaneous abortion where embryo is retained in uterus for four-weeks or more after its death, is very poor. Aiming to improve the level of knowledge about this process, we have compared glycosylation patterns of placental proteins in normal pregnancy and missed abortion. Oligosaccharide branches were detected by Western-blot using SNA, DBA and PHA-E lectins.

Protein patterns during final differentiation of some rat organs.

1. Protein composition of rat brain, and of heart and skeletal muscle was analysed by polyacrylamide gel electrophoresis in their late fetal and postnatal development. 2.