 You are invited to participate in a research study to develop new ways to look for abnormal areastissues of the colon. The current endoscopes used to look at the colon are very good, but if the area doesnt look different to the naked eye, then the endoscope cant improve on that. We are looking at using special fluorescent stains in addition to special endoscopes designed to see abnormal areas that are not obvious to the naked eye. Currently specialized microscopes and fluorescent stains are used in clinical laboratories but it takes several days of processing to get results. It may be very helpful to look for areas to sample for abnormal tissue during the endoscopy procedure. 