Anything that will stop my legs aching after an hour on the cross trainer sounds like a bonus to me; however is tweaking the genetics of mice the same as letting nature take its course? Ultimately a prey species will evolve to avoid the predator or it’ll become an extinct prey species. Anyway I am looking forward to being able to do to hours cross-trainer without getting achy legs.
http://www.telegraph.co.uk/science/scie ... mouse.html