The meaning of life.
D000818:Animals; D033421:Beginning of Human Life; D019976:Cloning, Organism; D033041:Embryo Research; D004622:Embryo, Mammalian / Q000502:physiology*; D005307:Fertilization in Vitro; D006801:Humans; D019369:Life; D051379:Mice; D013234:Stem Cells