IL10 and myeloid sarcoma: Interestingly, we found that the levels of IL-10 in co-cultures of Tregs from UC-MSC-primed PBMCs of MS patients with allogenic or autologous Teffs were significantly higher than those in the co-cultures of Tregs from naïve PBMCs of the same MS patients with allogenic or autologous Teffs (Figure 4A & 4B), suggesting that the improved cytokine production capacity may have contributed to the increased frequency and suppressive function of Tregs from MS.