Fig.5 (A) Mechanical behavior and properties of electrospun PLGA/GelMA-PDA fibers. (B) SEM images showing the surface morphology of a bilayer S+F-PDA scaffold. (C) SEM image showing the cross-sectional view of a bilayer S+F-PDA scaffold. (D) Characteristic tensile stress-strain curve of bilayer S+F-PDA scaffolds. (E) Shape morphing of a bilayer S+F-PDA scaffold from its planar shape to tubular structure when immersed in the culture medium at 37 ℃. (The black layer was the PLGA/GelMA-PDA@E2 fibrous layer.)