Cloning, OrganismNuclear Transfer TechniquesClone CellsCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceCell LineDNA, ComplementarySequence Homology, Amino AcidHeLa CellsDNARNA, MessengerSequence AlignmentRestriction MappingPlasmidsEscherichia coliRecombinant ProteinsGene LibraryGenes, BacterialSequence Homology, Nucleic AcidGene Expression