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Schematic images of (A) gelatin/alginate hydrogel and its composite with Hap nanoparticles and (B) two-step hydrogel gelationprocess. (C) Rheological properties of hydrogel composites (left: shear stress plotted over a shear rate, right: elastic modules over 3 day). (D) Opticalmicroscopic and micro-CT images of 3D printed patterns. (reproduced with permission from [16]. Copyright 2014, Elsevier Ltd).
