TNF and colitis: To further confirm the in vivo anti-inflammatory nature of apoptotic WJ-MSCiCasp9+/Luc+, we measured at day 4 and day 9 after TNBS instillation the levels of the pro-inflammatory cytokines TNFα and IL6 in the serum and found a pronounced decrease in the levels of both cytokines in colitis mice treated with apoptotic WJ-MSCiCasp9+/Luc+ as compared to untreated mice (Fig. 3G).