MRC1 and type 2 diabetes mellitus: Confocal micrographs showed that the number of CD163-positive and CD206-positive cells was elevated in the MSC-treated group, while the number of iNOS-positive cells decreased in the MSC-treated group compared with the numbers in the T2DM group (Fig. 7a–d; Additional file 1: Figure S2a-d); there were no significant differences in the number of F4/80-positive cells (data not shown).