From David Hulme, Stockport, Greater Manchester, UK
I have often wondered whether mouth wounds heal faster than skin wounds, and it was good to see research answering this (4 August, p 16). It seems to open up new research possibilities related to wound healing. I now wonder whether the genes involved are evolutionarily conserved, ancient and now widespread. They would provide a crucial advantage in the constant fight to survive and reproduce. All animals need their mouths in the best condition for feeding.
