Very simply put, it's basically a sensing apparatus. It's trying to understand how bad things are in a cell. And usually people would say, well, first, if there was a singular function, it's how poorly is the genetic code doing, which is to say the chromosomal architecture, how intact versus non-intact is it? how many mistakes, mutations or mistakes, so insults versus mistakes, how many of those exist and are being repaired at any one time?