Fig. 9From: Preparation of gamma poly-glutamic acid/hydroxyapatite/collagen composite as the 3D-printing scaffold for bone tissue engineeringH&E staining of the collagen-based 3D scaffolds and 2D membrane implanted in the nude mice model after weeks 1, 2, and 4 (blue arrows indicate the scaffolding areas, yellow arrows indicate blood vessel development, and the scale bar size is 100 µm)Back to article page