Scanning electron micrographs, macroscopic images (insets), and rheological characterization of collagen I and kidney dECM hydrogels. SEM and macroscopic images of (A) collagen I hydrogel at 2.5 mg/mL, (B) kidney dECM hydrogel at 1.0 mg/mL, (C) kidney dECM hydrogel at 2.5 mg/mL, and (D) kidney dECM hydrogel at 5.0 mg/mL. Rheological characterization of hydrogel formation over time with measured shear moduli plotted on a logarithmic scale of (E) collagen I hydrogels at 2.5 mg/mL, (F) kidney dECM hydrogels at 1.0 mg/mL, (G) kidney dECM hydrogels at 2.5 mg/mL, and (H) kidney dECM hydrogels at 5.0 mg/mL.