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Physical map of the dystrophin gene. Green boxes indicate exons, blue boxes indicate exons specific for each promoter (B1, first brain exon; M1, first muscle exon; P1, first Purkinje exon), and red boxes indicate promoters (BP, brain promoter; G1, general type promoter; MP, muscle promoter; PP, Purkinje promoter; S1, Schwann cell promoter). Not drawn to scale.
