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Rheological properties of the BG/GelMA biomaterial ink: flow behavior of 0%, 1%, 5%, and 10% BG (A) at 60 °C and 4 °C (B) after 0 min and 5 min (C) the elastic moduli (G′) and viscous moduli (G″) shear–strain; (D) the viscosity–shear rate; and (E) the shear moduli–angular frequency of the respective biomaterial inks. The ‘sol’ means the biomaterial inks went from liquid to gel and the ‘gel’ means from gel to liquid.
