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Enhanced radiotherapy of nonobese diabetic-severe combined immunodeficiency (NOD/SCID) mice harboring subcutaneous MDA-MB-231 tumor. Mice in group 1 received vehicle only, those in group 2 received vehicle plus irradiation (IR), and those in group 3 received gold hMSCs on 3 separate occasions before IR. In total, 4 animals were studied per group.
