Fig. 3From: Biomineralized tetramethylpyrazine-loaded PCL/gelatin nanofibrous membrane promotes vascularization and bone regeneration of rat cranium defectsCharacterization of the different membranes. A Porosity. B Water contact angle. C Air permeability. D FTIR spectra. E Stress–strain curve of the PG and PGH membranes. (n = 3). *p < 0.05; ** p < 0.01Back to article page