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(a) Scheme of the architecture of porous and non-porous hydrogels. Reproduced with permission from [70], published by Springer Nature, 2016; (b,d) Photographs of wet alginate scaffolds and (c,e) SEM images of dry alginate scaffolds: (b,c) — non-porous. Reproduced with permission from [71], published by John Wiley & Sons, 2016; (d,e) — porous alginate scaffold. Reproduced with permission from [72], published by Springer-Verlag Berlin Heidelberg, 2018.
