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Increased viral stability in PLL-functionalized hydrogels at 37°C. PEG hydrogels with 2.5 mM RGD and either 30–70 kDa PLL or additional RGD (0.45 mg/mL) were incubated with virus at 37°C for 3 h (n = 3). All hydrogels were washed and incubated with PBS. At each time point, the PBS was replaced with HT1080 cells and subsequent luciferase expression was assayed 72 h later (**P ≤ 0.01; ***P ≤ 0.001).
