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A schematic diagram of the three major types of organ 3D bioprinting technologies: (A) two-nozzle extrusion-based bioprinting (a: pneumatic; b: piston); (B) two-nozzle inkjet-based bioprinting (a: heater; b: piezoelectric actuator); (C) three-channel laser-assisted bioprinting. Image reproduced with permission from [26].
