The latter procedure removes the nucleus of a somatic cell and transfers it to an enucleated egg cell
There are few phenomenon in cell biology as remarkable as the ability of the egg cell
to reprogram a cell from the human body back to its original embryonic state," said Dr.
Researchers will take a skin cell, invisible to the naked eye, and put it into an ovum ( an egg cell
( which has not been fertilised and therefore would never form a human being.
Blastocyst: After the nucleus of a somatic cell is inserted into the place of the evacuated egg cell
nucleus, the resulting cell begins to grow and divide.
The process of human cloning begins with removal of the nucleus from a human cell, such as a skin cell and transferring it to a woman's egg cell
from which the nucleus has been removed.
For dais to happen, these cells must first join their genetic material together to form a fertilized egg cell
with a totally new and unique version of the human genome.
Eleanor Nicoll, public affairs manager for the American Society for Reproductive Medicine, reports that scientists at the Weill Medical College of Cornell University in New York City are working on a method to replace the genetic material in a female egg cell
with the nucleus of a 46-chromosome male cell.
In this technique an egg cell
is activated without being fertilized by a sperm cell.
The second, third and fourth steps of this process, respectively, are the acrosomal reaction, the sperm cell and egg cell
adhesion through the vitelline envelope, and the actual membrane contact between the two cells.
ACT scientists said they had grown a six-cell human embryo using a human egg cell
and a human skin cell to create the clone.
Scientists can take an egg cell
, remove its DNA, insert DNA from a cell of any person, and create an embryo who is that person's younger but identical twin.
The nucleus will be implanted into an egg cell
extracted from the ovaries of the woman after the nucleus of the egg cell