CCR6 and colitis: A distinct set of immune phenotypes correlated with colitis severity, but not weight loss; the percentage of total Teff cells in colon increased proportionately with colitis severity (r = 0.714; P = 0.031), whereas frequency of both CCR6+ (r = -0.946; P = 0.0001) and α4β7+ (r = -0.642; P = 0.042) Teff cells in colon inversely correlated with colitis severity.