MyoD ProteinMyogeninMuscle ProteinsHelix-Loop-Helix MotifsMuscle, SkeletalMusclesCell DifferentiationMuscle DevelopmentMuscle Fibers, SkeletalMuscle, SmoothMethylhistidinesPhenylalanineMyogenic Regulatory Factor 5Muscle ContractionMuscle, Smooth, VascularMuscular AtrophyLeucineMuscle Fibers, Fast-TwitchAmino Acids, EssentialMyoblastsMuscle DenervationAmino AcidsMyogenic Regulatory Factors