In other words, it contains the information that tells the body how to work and develop. The technique that makes cloning possible is nuclear transfer. It was first explored in the 1920s by Hans Spemann for the purpose of conducting genetics research, the study of heredity and genes in living organisms. It is still used in every true cloning laboratory around the world, and every cloning experiment involving adult mammals has employed it. It is basically the same idea as having twins.
Nuclear transfer requires two cells, a donor cell and an oocyte, or egg cell.
Contrary to previous belief, research has proven that the egg cell works optimally if it is unfertilized. First, the egg cell must be enucleated. This means that the nucleus is removed from the cell. Since the majority of its genetic information is stored in the nucleus, this eliminates the cell's heritage. This is done in different ways, depending on the technique.