Figure 3: SEM images of hepatocytes in the 3D constructs with different concentrations of gelatin in the gelatine/alginate/fibrin hydrogel 1 h after the 3D printing: (a)- (c) 10% (w/v) gelatin in the gelatine/alginate/fibrin hydrogel with different magnifications; (d)-(f) 20% (w/v) gelatin in the gelatine/alginate/fibrin hydrogel with different magnifications.