Fig. 8From: Preparation of gamma poly-glutamic acid/hydroxyapatite/collagen composite as the 3D-printing scaffold for bone tissue engineeringBMP-2 concentration of hADSCs cultured on the 3D scaffolds and 2D membrane for 2, 5, and 7 days (n = 3, * p < 0.05, ** p < 0.01, *** p < 0.001). Back to article page