Now, while I don't want to come across as a PETA softy, but the details of this experiment make me doubt somewhat whether its scientific benefits make the treatment of the mice worth it. (I say that, though, very unaware of the treatment of lab mammals, generally. There are probably far worse examples.)
My feelings about animal experimentation are still influenced somewhat by the anti-vivisectionist sentiment and argument of CS Lewis. You can read about that here.