Fig. 7

a H & E staining was performed to detect infiltration of immune cells in the heart. Photomicrographs of heart sections (×200) from different groups: control, streptozotocin (STZ), STZ + doxorubicin (STZ + DOX), bone marrow-derived mesenchymal stem cells (BM-MSCs) and adipose tissue-derived mesenchymal stem cells (AT-MSCs) . Black arrows indicate infiltrating immune cells. b Histograms show percent area of immune cell infiltration. c CD31 expression in the myocardium was examined by immunohistochemistry (magnification × 200) in different groups. Black arrows indicate CD31⁺ cells; wavy arrows show damaged muscle tissue. d Histograms show percentage of CD31⁺ cells. Quantification of the cells in various groups was performed using the Leica Qwin 500 LTD computer-assisted image analysis system (Cambridge, UK). The measurements were done in 10 high power fields in all the experimental groups. ^@ P <0.05 compared to STZ, ^▲ P <0.05 compared to STZ and STZ + DOX