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(a) Optical microscope representative images of the 2.5Gel3 and 3Gel4 hydrogels for the pores’ morphological analysis. Image area = 25 µm2, scale bar 1 µm; (b) average pore size (µm) of the 2.5Gel3 and 3Gel4 hydrogels and (c) average pores number, as analyzed by ImageJ software; * p < 0.01.
