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Comparison of UV-vis spectra of AgNPs–silk solutions: (A) in pH 5.0, 7.4, and 10.0; (B) at room temperature (RT), 50 °C, 75 °C, and 100 °C; (C) at room temperature, 37 °C, 50 °C, and 65 °C for 15 days; (D) at room temperature, −20 °C, −80 °C, and −196 °C for 15 days.
