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(a) Setup used to detect protein diffusing from the hydrogel into the aqueous solution after 785 nm laser irradiation. (b) Fluorescence emission spectra of the protein recorded after exposing the hydrogel to laser light (1 W) for a certain amount of time (indicated). (c) Plots of the fluorescence emission intensity vs. NIR irradiation time, showing a temporal control of the protein release by turning the NIR laser on and off.
