Mean+SEM (A-B) ADP/AMP ratio and (C-D) AMP/adenosine ratio in untreated, UCB, L-Kynurenine and quercetin-treated Treg and Th17-cells 5, 10, 20, 40 minutes after addition of 14C-labelled ADP (HS, n=4; AIH, n=4). (E) Mean+SEM % inhibition of CD4+CD25−-cell proliferation in the presence of untreated or treated Treg is shown (HS, n=8; AIH, n=10). *P≤0.05; **P≤0.01; ***P≤0.001 (one-way ANOVA).