Sentences with phrase «nucleus of a fertilized egg»

The DNA in the nucleus of the fertilized egg contains all the instructions needed to make all the different proteins and all the different sorts of structures in all the different sorts of cells in the body.

Not exact matches

The method, called somatic cell nuclear transfer (SCNT), replaces the DNA in an egg cell's nucleus with the genetic material from the nucleus of a skin cell, then tricks the egg cell to start dividing as if it had been fertilized with sperm.

But like the medieval alchemists, today's cloning and stem cell biologists are working largely with processes they don't fully understand: What actually happens inside the oocyte to reprogram the nucleus is still a mystery, and scientists have a lot to learn before they can direct a cell's differentiation as smoothly as nature's program of development does every time fertilized egg gives rise to the multiple cell types that make up a live baby.

Cytoplasmic transfer involves injecting a bit of cytoplasm — the jellylike substance that surrounds the nucleus of an egg — from a healthy donor egg into the egg of an infertile woman before the egg is fertilized.

This method involves removing the freshly fertilized nucleus from an egg that has little chance of further development because of age or disease and injecting it into the donor egg.

The researchers then injected the nucleus of an egg from a second macaque, fertilized the cell with sperm, and implanted it in the second monkey's womb.