Satellite Cells, Skeletal MusclePAX7 Transcription FactorMuscle DevelopmentMuscle, SkeletalMyoD ProteinCell DifferentiationRegenerationCardiotoxinsMuscle Fibers, SkeletalCells, CulturedCell LineageSatellite Cells, PerineuronalMyoblastsMusclesMyogenic Regulatory Factor 5DNA, SatelliteMyogeninStem CellsCell ProliferationMice, Inbred mdxPaired Box Transcription FactorsMuscle ProteinsDesminMice, Inbred C57BLSignal TransductionMyoblasts, SkeletalCell DivisionRNA, MessengerRNA, SatelliteGene Expression Regulation