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Stacking test of DDMp bio-inks. Microscopy images (scale bar: 5 mm) (a) and measured heights (b) of multilayered structures printed with DDMp bio-inks in the change of the number of stacked layers (n = 6), (c) visualized printing code and (d) fabrication result of tooth-shaped hydrogel construct printed with DPSC-laden DDMp bio-ink (10% w/v) (scale bar: 10 mm). The visualized code indicates the printing paths to produce the designed 3D structure. ** p < 0.01; *** p < 0.001.
