Get the book from AMCAS on Medical schools; it will help you to understand all the schools you are applying to much better, and that will be very important when you go to interview; that said, I know there are several schools that specifically mention biomedical research experience as being important: Cornell, U. Chicago and several others. Most schools simply say that relevent medical-related experience is important, and from my understaning that could be either clinical or research. But it can't hurt to have a little of both, ya know?😉