Mice, Inbred C57BLMice, Inbred C3HAnimals, Outbred StrainsPhenotypeSpecies SpecificityMutationMolecular Sequence DataBase SequenceGenotypeMice, KnockoutAmino Acid SequenceAllelesCell DifferentiationCells, CulturedMice, TransgenicChromosome MappingCrosses, GeneticSignal TransductionRNA, MessengerGene DeletionPedigreeGenetic Complementation Test