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Schematic presentation of the steps of in situ gelation including (A) application of sodium alginate solution on top of a dry calcium alginate foam; (B) Rehydration of the foam by the alginate solution filling its pores, and diffusion of calcium ions from the foam lamellas to the absorbed alginate; (C) Formation of a calcium alginate hydrogel inside the pores of the foam. The alginate solution may contain cells or other materials that will be entrapped in the hydrogel that is formed.
