Progeria cells are stimulated to repair DNA by co-cultivation with normal cells.

@article{Brown1976ProgeriaCA,
  title={Progeria cells are stimulated to repair DNA by co-cultivation with normal cells.},
  author={William Ted Brown and James Epstein and J. B. Little},
  journal={Experimental cell research},
  year={1976},
  volume={97 2},
  pages={291-6}
}