Fig. 5. ELISA analysis of cytokines (IL-4 and IL-10) in the conditioned media from M0, M1, M2 macrophages and M0 macrophages treated with M1NGs and M2NGs (A and C) at the 4^th day of polarization. Conditioned media post polarization at day 2 post the medium replacement (B and D) (ns = not significant, *P < 0.05, and **P < 0.01).