MYOD1 and Duchenne muscular dystrophy: Reversibly immortalised MyoD‐ER‐transduced healthy donor mesoangioblasts (hTERT + Bmi1 H#2) or DYS‐HAC‐corrected DMD mesoangioblasts [riDMD(DYS‐HAC2)#A] were injected into tibialis anterior muscles of scid/mdx mice.