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Frequency sweeps of A4H3B4H3-containing hydrogels with different Zn2+:His ratios. The frequency sweeps were performed from 100 to 0.001 rad s−1 at a constant strain amplitude of 1%, using Zn2+:His in ratios of 1:1, 1:2, 1:10, 1:20 and 1:100.
