I would just like to add briefly that I think the lamprey example is sort of a false hope, in some sense. I don't want people to always think there will be that kind of solution. It's a wonderful case story, where the biology really mattered and we were able to sleuth it out.
On the other hand, I'd like to say there are promising things, especially with certain molecular approaches, and I think in the future we'll be able to use instruments that are less blunt, in terms of doing this. I think of the blackfly control program using Bti, a type of bacterial pathogen for the fly, and targeting the larval stage in the water rather than the adult. So that's an example of how you can target certain things with not exactly a magic bullet, but something much more precise than the chemical treatments that would often be used in normal cases.