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Schematic representation of the study process: from the bioink formulation to the fabrication of 3D bioprinted constructs containing cells, the growth factor release was limited in a compacted fibrin network. In vitro cyto-compatibility and in vivo biocompatibility of constructs were performed. AG, alginate/gelatin; GF cells, gingival fibroblast cells; iPAG, i-PRF/alginate/gelatin; i-PRF, injectable platelet-rich fibrin
