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Cross-sectional SEM image of hydrogels (a–e) before incubation in PBS and hydrogels (f–j) after 7 days of incubation in PBS at 37 °C. Result of swelling ratio (%) of Alg, P, P1G1, P2G3, and P1G4 microbeads loaded in alginate hydrogel (k). Result of the porosity of different microbeads-loaded hydrogels (l). (*P < 0.05, **P < 0.01, ***P < 0.001). Scale bar is 100 µm
