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All samples were irradiated with 20mW/cm2 of green light (530 nm LED lamp, ThorLabs) for 10 minutes. Cell compatible = 420 mM PEG-diacrylate, 21 mM triethanol amine, 35 mM vinyl pyrrolidone, in phosphate buffered media (pH = 7.5). Unconstrained = 420 mM PEG-diacrylate, 210 mM triethanol amine, 35 mM vinyl pyrrolidone in deionized water.
