It requires only equipment and facilities that are already standard or easy to obtain by biomedical laboratories and free-standing in vitro fertilization clinics across the country and across the world. Although the protocol itself demands the services of highly trained and skilled personnel, there are thousands of people with such skills in the United States alone. If Silver is right, then we must start thinking seriously about human cloning. These are big questions, not easily answered, especially when talking about cloning in general. This area was chosen because it's likely to be a driving force behind the push to clone humans, and it is one in which we can see both potential harms and benefits.
Cloning refers to any attempt to produce a genetically identical copy of another organism.
What this general definition leaves out, however, are the different means by which cloning is achieved. In humans, embryo splitting is done between the 2 and 8-cell stage of division, on the second and third day of life. After this point the cells, at least those on the outside of the embryo, begin to differentiate, losing the potential to become any kind of tissue. These differentiated cells retain their entire genome, but only those parts needed for the cell's function are turned on. This can create a new, totipotent embryo, in which the donor nucleus supplies the genetic material and the egg's cytoplasm supplies the signals needed for an embryo to develop.