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The structural and mechanical properties of NP-doped GelMA. (a) The appearance and color of NP-doped GelMA thin films. (b) SEM images of the morphology of each NP. (c) SEM images showing the porous structure of NP-doped GelMA hydrogels. (d) Stress–strain curves of GelMA and NP-doped GelMA. (e) The calculated Young’s modulus of each sample.
