Further development of the design, like extraembryonic membranes ( amnion, chorion, and allantois ) and a calcified shell, were not essential and probably evolved later.
22.
It is known that the mouse AMN gene is expressed in the extraembryonic visceral endoderm layer during gastrulation, but it is found to be mutated in amnionless mouse.
23.
In studies where PMCs are cultured in insolation, the cells were observed to gain affinity for fibronectin and simultaneously lose affinity for extraembryonic matrix, independent of the embryonic environment.
24.
Almost all of the embryos survive to the end of incubation, but they are unable to clear the fluid from their lungs or absorb the blood from their extraembryonic vessels.
25.
But embryos fed by a placenta or extraembryonic yolk supply can grow very fast, and changes to relative growth rate between parts in these organisms help to produce the final overall anatomy.
26.
In some cases, the vegetal pole is thought to differentiate into the extraembryonic membranes that protect and nourish the developing embryo, such as the placenta in mammals and the chorion in birds.
27.
When Gata6 genes by CRISPR-mediated activators, thus directly converted mouse embryonic stem cells into two extraembryonic lineages, i . e ., typical trophoblast stem cells and extraembryonic endoderm cells.
28.
When Gata6 genes by CRISPR-mediated activators, thus directly converted mouse embryonic stem cells into two extraembryonic lineages, i . e ., typical trophoblast stem cells and extraembryonic endoderm cells.
29.
During formation of the primitive yolk sac, some of the migrating hypoblast cells differentiate into mesenchymal cells that fill the space between Heuser's membrane and the Trophoblast, forming the extraembryonic mesoderm.
30.
True, the allantois begins as an evagination of the gut that extends into the body stalk ( the umbilical cord anlage ), but the umbilical cord itself is made mostly of extraembryonic mesoderm and Wharton's jelly.
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