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Schematic showing the 3D bioprinting of cells with the relevant bioinks. hPDLFs suspended in Gel-MA were bioprinted as the top periodontal layer, whereas hOBs suspended in Gel-MA/HAp-MNP were bioprinted as the bottom alveolar bone layer. The hybrid hydrogels contained the radical photoinitiator and were stabilized by UV light at a wavelength of 365 nm to form the 3D-bioprinted periodontal/osteoblastic microtissue construct within the microfluidic chip.
