a GAG composition profile of total HS, CS, HA, and KS in native and decellularized axolotl and porcine retina. b amount of total HS, CS, HA, and KS in native and decellularized axolotl and porcine retina. The error bars represent standard deviation from the biological variability (four axolotl and six porcine for both native and decellularized). Each biological sample was run in triplicates (these error bars not shown)