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Figure 3. SEM micrographs and visual appearance of cellulose-in-cellulose aerogels. (A and B) MC; (C and D) MC NF0.5-6; (E and F) MC NF20-6. Aerogels exhibit hierarchical porous structures with well-defined 3D-printed patterns, where the incorporation of BC-NF enhances mesopore and macropore formation, favorable for nutrient diffusion and cell infiltration. (Reprinted from Iglesias-Mejuto et al.^[92]. Copyright 2024 Springer Nature.). SEM: Scanning electron microscopye; MC: methyl cellulose; NF: nanofiber; 3D: three-dimensional; BC-NF: bacterial cellulose nanofibers.