Cloning, OrganismNuclear Transfer TechniquesClone CellsCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceCell LineDNA, ComplementarySequence Homology, Amino AcidDNAHeLa CellsRNA, MessengerSequence AlignmentPlasmidsEscherichia coliRestriction MappingRecombinant ProteinsSequence Analysis, DNAGene ExpressionSequence Homology, Nucleic AcidGenes, BacterialGene LibrarySpecies SpecificityPolymerase Chain ReactionMutation