Fig. 3From: HIF-1α overexpression in mesenchymal stem cell-derived exosomes mediates cardioprotection in myocardial infarction by enhanced angiogenesisMigration of hypoxia-treated HUVECs was reversed by Exo-HIF-1α. a Representative figures of migrated HUVECs using a modified Boyden chamber. Bar: 50 μm. b Quantitative assessment of migrated cells per high power field (n = 3). *P < 0.05, **P < 0.01Back to article page