28. In one type of cloning, the nucleus of a cell taken from the blastula stage of an embryo is inserted into an enucleated egg cell (an egg cell with its nucleus removed). The nucleus of a cell taken from a more mature embryo would be less suitable for this type of cloning because such a nucleus would lack some of the genes needed to develop into a total organism be specialized because differentiation would have begun be too large to fit inside an enucleated egg cell undergo only meiosis, whereas cells of early embryos would undergo only mitosis.