NCAM1 and Crohn disease: Subsequent analysis at the single-cell level (Fig. 5b) identified a CD56+ population within the CD28−CD4+ T cells that is enriched in blood of patients with Crohn’s disease (Fig. 5b, bottom panels, dashed black circle), as well as a CD56− population of CD28−CD4+ T cells (Fig. 5b, bottom panels, dashed yellow circle) present in blood samples of both patients and controls.