CDKN1A and myotonic dystrophy type 1: We also detected elevated levels of p19Arf, p21Cip, and p27Kip and reduced levels of Bmi1 and Ki67 in muscle from DMSXL mouse model (Figure 4M), while p14ARF and p21CIP1 presented elevated levels in DM1 PBMCs (Figure 4N).