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Rheological properties of the hydrogel ink: (a) Frequency and (b) strain (at a frequency of 1 Hz) dependence of storage and loss moduli. Inset in (a) shows the magnified plot for the frequency of 0–10 Hz; (c) Complex viscosity of the hydrogel precursor. Inset shows the magnified plot for the shear rate of 0–5 1/s; (d) shear stress vs. shear rate plot.
