A complementary DNA encoding the human low density lipoprotein (LDL) receptor under control of the mouse metallothionein - I promoter was injected into fertilized mouse eggs, and a strain of mice expressing high levels of LDL receptors was established. (science.sciencemag.org)
«Using fertilized mouse eggs, we showed that the egg cell actively triggers demethylation of the paternal DNA — in other words, it initiates epigenetic reprogramming by stripping any previous epigenetic memory passed on from the father. (sciencedaily.com)
He tried fertilizing a mouse egg by injecting genetic material from another female mouse, but it didn't work: None of the mice without any male genes developed to term. (discovermagazine.com)