Gene Expression Profiling; Gene Expression Regulation; Gene Expression; Muscles/physiology; Muscular Dystrophy, Duchenne/genetics; Mutation; Regeneration; Adolescent; Animals; Bone Morphogenetic Protein 15; Child; Cluster Analysis; Down-Regulation; Drosophila Proteins/metabolism; Growth Differentiation Factor 9; Humans; Intercellular Signaling Peptides and Proteins/biosynthesis; Intercellular Signaling Peptides and Proteins/genetics; Intracellular Signaling Peptides and Proteins/genetics; Mice; Mice, Inbred C57BL; Mice, Inbred mdx; Models, Biological; Muscles/pathology; Muscular Dystrophy, Duchenne/metabolism; Neuregulins; Nucleic Acid Hybridization; Oligonucleotide Array Sequence Analysis; Oligonucleotides/chemistry; RNA/metabolism; Receptors, Notch/metabolism; Reverse Transcriptase Polymerase Chain Reaction; Satellite Cells, Skeletal Muscle/metabolism; Signal Transduction; Time Factors; Up-Regulation