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Figure 2. Schematics of bioinks (A), 3D bioprinting methods (B) and the application of 3D bioprinting (C). (A) Bioink typically includes biological molecules, live cells, cross-linker, and polymers (GelMA hydrogel). (B) Current widely used 3D bioprinting techniques of extrusion, inkjet and laser-assisted bioprinting. (C) Three main applications of 3D bioprinting lie in drug screening, in vitro disease models and tissue regeneration.