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pH-dependent rheological analysis of PIC-DNA cross-linked with 0.9 equiv of DNA cross-linker THC at 30 °C in PBS, 10 × 10–3 M MgCl2. (a) The triple helix motif (green trace) is in a random extended state at pH 7.4 but forms a stable structure at pH 5.2. (b) Time evolution of storage modulus G′ after addition of DNA cross-linker THC at pH 7.4 (blue) and pH 5.2 (green). (c) K′/G0 as a function of σ at pH 7.4 (blue) and pH 5.2 (green).
