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(a) Diameter of GelMA microgels (8 wt %), before and after swelling in PBS, was controlled by the ratio of flow rates of aqueous phase (GelMA pregel solution) to oil phase (QAq/QO). (b) Force-displacement curve of a GelMA microgel measured by an AFM-assisted nanoindentation. Elastic modulus (E) was calculated using Hertz contact mechanics theory (eq 1).
