The present invention refers to a method for reconstructing a non-human animal embryo, to a method for generating a nonhuman animal and to a non-human animal or non-human animal reconstructed embryo obtainable by the methods according to the invention. The method of somatic cell nuclear transfer (SCNT) has a step of transiently expressing or inducing the uptake of a protein involved in male sperm maturation, such as protamine or transition protein, in the somatic donor cell before nuclear transfer.
