 This is a phase 1 study. This means that this is the first time we have used this kind of fluorescent peptide in people. The Food and Drug Administration FDA has not approved this agent, but is allowing us to test it in this study. The goal of this study is to see if there are any side effects from using the peptide. We have used a similar peptide that weve developed for the esophagus in over 40 patients without any side effects. 