Fig. 7From: LPS-preconditioned mesenchymal stromal cells modify macrophage polarization for resolution of chronic inflammation via exosome-shuttled let-7bThe progression in healing of cutaneous wounds in diabetic rats. a Appearances of wounds in different groups at various time points. b Histological analyses of cutaneous injury in diabetic rats at 3 days. There are apparently decreased inflammatory cell infiltration (black arrows) and promoted the appearance of new small capillaries (white arrows) in the Dia + LPS pre-Exo group. Scale bar 200 mmBack to article page