IL17A and systemic lupus erythematosus: The addition of CD4+CD25+CD127low UCB-Tregs to the proliferating SLE-PBMCs significantly decreased the secreted IL-17A levels to 4,705 ± 43 pg/ml at 3 days (p = 0.0012) and 10,438 ± 668 pg/ml at 7 days (p < 0.0001, Figure 2F).