Matt: I'm not throwing it out there to confuse... come now... we have much history! :-) > > There are tantalizing puzzle pieces here. I'm reminded of Number Theory: Tons of problems--trivially easy to define. Nearly impossible to solve.-I think the legitimate answer is we don't know where prions fit in. I'm glad you are back, and I hope it is for a good length of time. What's happened with your book?