This seems like a really good question to raise, and I'm embarrassed that I didn't think of it at all. I know carcinogen studies are already touchy since cancer

This seems like a really good question to raise, and I'm embarrassed that I didn't think of it at all. I know carcinogen studies are already touchy since cancer risks vary so wildly, but this is a nice reminder that even within primates you get this kind of problem.