Subject Recruitment Healthy control subjects and patients with Crohn's disease and ulcerative colitis will be recruited in Edmonton from the University of Alberta Hospital gastroenterology clinic. Male and (non-pregnant) female adults (> 17 year of age) are eligible for study. Pre-operative IBD patients with mild to moderate disease including those with rectosigmoiditis, left-sided colitis, concurrent small bowel disease, and Crohn's will be recruited. Diagnosis will be based on established radiologic, endoscopic, and histologic criteria.