A protein best known for protecting chromosome ends also plays a crucial role in muscle repair, according to a new study from researchers at the Perelman School of Medicine at the University of Pennsylvania. The findings suggest TRF2 helps muscle stem cells maintain their identity and coordinate the cycle of rest, repair, and renewal, keeping them ready to mend damaged muscle tissue. Without it, injured muscle may turn into fat and scar tissue instead of healing properly. The research offers new clues for treating muscular dystrophy and may also explain why muscle cancers are rare, providing fresh insights into cancer mechanisms.