Fig. 7From: GelMA/PEGDA microneedles patch loaded with HUVECs-derived exosomes and Tazarotene promote diabetic wound healingMicroneedles induce angiogenesis. a Tube formation in HUVECs treated with different MNs patch compared with the control group at different time point. Scar bar, 100 μm. b Qualification of closed tubular structures. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001Back to article page