CDKN2A and Duchenne muscular dystrophy: To identify the cell type of senescent mononucleated cells, we performed in situ hybridisation of CDKN2A mRNA on muscle sections from randomly selected 5 patients with DMD (Patient Number: 12, 25, 30, 35 and 40) and 3 non-DMD controls (Patient Number: 7, 8 and 9).