Cloning, OrganismBioethicsReproductive Techniques, AssistedClone CellsCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceFetal BloodCells, CulturedFetusCell DifferentiationCell TransdifferentiationRNA, MessengerNuclear ReprogrammingDNA, ComplementaryCell LineAnimals, NewbornEmbryonic Stem CellsSequence Homology, Amino AcidPluripotent Stem CellsAgingStem Cells