IL10 and systemic lupus erythematosus: As shown in Figure 1D, on day 3 of culture, high levels of IL-10 were detected in the supernatants of UCB-Tregs (4,844 ± 78 pg/mL) whereas the production level of soluble IL-10 was 190 ± 14 pg/mL in SLE-PBMC alone and 3,505 ± 18 pg/mL in the coculture of UCB-Tregs with SLE-PBMC.