Utrophin intensity was increased on mature muscle fibres in the 7 DMD biopsy samples P9–15 (median: 332; IQR: 238–463) compared to the 3 BMD samples P5–7 (median:119; IQR:91.7–156) (Fig 1) and the single BMD/DMD intermediate patient P8 (median: 111; IQR: –94.5–152) analysed (Fig 2a). This evidence concerns the gene DMD and Duchenne muscular dystrophy.