Fig. 3

Biodegradation and drug release of the (BY + EGF)@MNs. a Schematic of drug release of (BY + EGF)@MNs. b The dissolution curves of MN bases with the gradient carbomer contents (n = 3). c Release curves of the BY from (BY + EGF)@MNs at different pH (n = 3). d Degradation of (BY + EGF)@MNs with different GelMA concentrations in 2.6 U/ml collagenases (n = 3), and corresponding fluorescence images of degradative MN tips after 0 and 12 h. e Release curves of the EGF from (BY + EGF)@MNs at different pH (n = 3). The scale bar is 200 μm in (d)