Longitudinal analysis of liver and immune function in PSC + IBD patients during OV treatment. Serum (a) gamma-glutamyl transpeptidase (GGT) and (b) alanine aminotransferase levels (IU/L) over 12 months of OV (n=8). (c) Peripheral count (K/uL) of WBC, neutrophils, and lymphocytes over 12 months of OV (n=6). (d) Longitudinal changes in cytokine production patterns from Th1 (TNFα), Th2 (IL-4, IL-13), and Treg (TGF-β) subtype cells before and 3 months post OV administration in a separate cohort of children with PSC+IBD (n=6) initially reported on in the original Cox et al study [2]