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Figure 2. Comprehensive Illustration of Material Categories Used in 3D Bioprinting Inks: Natural Polymers, Cellulose Derivatives, and Nanocellulose. Natural Polymers include collagen, gelatin, and alginate. Cellulose Derivatives include CMC, MC, and HPC. Nanocellulose includes CNCs and CNFs. (Reproduced from “Cellulose nanocrystals.jpg” by Maren Roman^[22] and “202406 Cellulose Nanofiber.svg” by DataBase Center for Life Science^[23].) 3D: Three-dimensional; CMC: carboxymethyl cellulose; MC: methyl cellulose; HPC: hydroxypropyl cellulose; CNC: cellulose nanocrystal; CNF: cellulose nanofiber.