Sentences with phrase «needed for egg cell»

Not exact matches

But these fertilised eggs never progressed beyond the two - cell stage, well short of the eight - cell embryo needed for re-implantation.

These cells need to «forget» their own programmed instructions and create a blank slate for the blueprint of either a sperm or egg cell to be laid down.

It gets stuck in the earliest stage of wormy development, making the same larval cells repeatedly while failing to form the organs and body parts needed for later life — including the vulva required to get the eggs out of its body.

From the time an egg begins to develop in one of a woman's ovaries, the granulosa cells serve as a communication system — signaling, for example, when the egg needs nutrients and proteins.

Besides the attempt to avoid the bioethical tug - of - war that is human stem - cell research, the scientists have a very logical reason for turning to cow eggs: In order to really study stem - cell development in a way that could lead to tangible benefits in medicine, researchers need to look at thousands and thousands of specimens, and human eggs are in short supply.