title: Cloning livestock: a return to embryonic cells.
mesh_terms: D000818:Animals; D000829:Animals, Domestic / Q000235:genetics*; D030801:Animals, Genetically Modified / Q000196:embryology* / Q000235:genetics*; D019976:Cloning, Organism / Q000379:methods* / Q000639:trends; D018507:Gene Expression Regulation, Developmental / Q000235:genetics*; D005818:Genetic Engineering / Q000379:methods* / Q000639:trends; D053652:Nuclear Transfer Techniques; D033581:Stem Cell Transplantation / Q000379:methods; D039901:Totipotent Stem Cells