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Multiscale composite scaffold preparation based on a gelatin methacryloyl (GelMA)/chitosan microspheres (GC-MSs) modular bioink: GC-MS preparation by a microfluidic approach (step 1), nerve cells seeded on GC-MS (step 2), GC-MS/GelMA modular bioink preparation (step 3), bio-fabrication of 3-D composite scaffold performed by extruding bioink with the 3-D printer (step 4). Reproduced with permission [72].
