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Stress relaxation tests on HAGA-HAMA and HAMA hydrogels. (A) Hydrogel samples were tested with 5% strain, which was then held at a constant rate for 1000 s. (B) Quantification of stress relaxation in the time scale at which the stress is relaxed to half of its initial value. The error bars indicate the standard deviation of storage modulus for each ink, presented as mean ± SD (n = 10, *p < 0.05, **insignificant).
