Fig. 1From: GelMA/PEGDA microneedles patch loaded with HUVECs-derived exosomes and Tazarotene promote diabetic wound healingMorphologies of GelMA hydrogels. a Formation Process of Hydrogels. b Formation Mechanism of Hydrogels. c 1H NMR spectroscopy of β-CD-AOI2. d 1H NMR spectroscopy of GelMA. e The FTIR of PEGDA, GelMA, and GelMA-PEGDABack to article page