Cloning, OrganismNuclear Transfer TechniquesCloning, MolecularClone CellsMolecular Sequence DataBase SequenceAmino Acid SequenceDNA, ComplementarySequence Homology, Amino AcidMice, Inbred C57BLRNA, MessengerDNASequence Analysis, DNASequence AlignmentSequence Homology, Nucleic AcidGene ExpressionPolymerase Chain ReactionEscherichia coliBlotting, NorthernGenes, BacterialChromosome MappingMice, TransgenicCell LinePlasmidsRecombinant ProteinsNucleic Acid HybridizationBlotting, SouthernDNA PrimersGenesPhylogenyAnimals, NewbornRestriction MappingTissue DistributionGene Expression RegulationMutation