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(a) Hardness and (b) adhesiveness of plain collagen, Col/ZPVP-1, Col/ZPVP-2, and Col/ZPVP-3 hydrogels at room temperature. Error bars represent the standard deviation (SD); n = 3; ns = non-significant (p > 0.05); *** p ≤ 0.001; **** p ≤ 0.0001.
