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A: CM-DiI-labeled endothelial progenitor cells (EPC) engrafted in medullary tubular structure (red), shown with 4,6-diamidino-2-phenylindole (nuclear stain, blue) and cytokeratin (tubular marker, green) costains. B: change in medullary blood oxygenation index, R2*, in response to furosemide. BOLD, blood oxygenation level dependent; RAS, renal artery stenosis; PTRA, percutaneous transluminal renal angioplasty. Values are means ± SE. P < 0.05 vs. *sham, †RAS+PTRA+EPC, and #RAS+PTRA.
