Furthermore, in colitis mice treated with hUC-MSCs, there was a notable decrease in serum levels of IFN-γ, IL-1β, TNF-α and IL-6 (Fig. 1, H-K), as well as reduced the mRNA expression levels of Ifng, Il1b, Tnfa and Il6 in the colons (Fig. S1, G-J). Here, IL6 is linked to colitis.