14S,21R-diHDHA treatment enhances anti-apoptosis action of mMSCs in kidneys after renal ischemia/reperfusion injury. Immunostaining against active caspase-3 was performed at day 3 post-I/R. (A) Representative kidney sections (magnification, ×200; scale bar=50 μm). (B) Active caspase-3+ apoptotic cells (cells/hpf ). Results are expressed as mean±SEM, n=6. *P<0.05 versus sham, †P<0.05 versus I/R control, ‡P<0 .05 versus MSCs.