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(a) 3D printed constructs (bottom) based on blueprints (top) by extruding 1%(w/v) chitosan-Ph ink containing 4 mM SPS and 1 mM Ru(bpy)3. Bars: 5 mm. (b) Change in diameter of printed disk in PBS. Disk structure was printed by extrusion-based bioprinting using 1%(w/v) chitosan-Ph, 4 mM SPS and 1 mM Ru(bpy)3. Bars: mean ± SD (n = 5).
