A common method used for animal cloning is somatic cell nuclear transfer (SCNT), which does not require egg fertilization. SCNT extracts the nucleus of an animal's cell (where nearly all of the necessary genetic information is stored) and also that of an egg cell. The donor nucleus is then inserted into the egg cell, which virtually adopts the new nucleus. Next, the egg is stimulated with a shock, at which point the cell starts to divide. After continued divisions, embryonic stem cells form, which can then be extracted and then injected into an embryo.