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Effect of enzymatic digestion of salmon PG on tube formation. A. Effect of protease-treated PG (1 mg/mL) on tube formation (n =6). B. Effect of chondroitinase ABC-treated PG (1 mg/mL) on tube formation (n =6). C. Effect of salmon PG, whale CS4S, or shark CS6S (1 mg/mL) on tube formation (n =4). The columns show values relative to the control (buffer)±SD. *p<0.05, **p<0.01 (Student's t-test).
