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Frequency of deleted exons observed in registrants with (a-c) deletion and (d-f) duplication mutations in the total study population (a, d), participants with BMD (b, e), and participants with IMD (c, f). Distribution of exon deletions shows common hot-spot regions in exons 45–54. There were no “hot spots” for duplications. Among IMD participants, hotspot deletion was less frequent compared to BMD participants.
