(A) IL-2 secretion of T cells characterized by flow cytometry. (B) IL-2 secretion of T cells activated for 4 hours on hydrogels with standardized coating (n=12 across 5 independent experiments), 0.1x coating (n=3 across 2 independent experiments), and 10x coating. Data are mean ± s.d., n=6 across 2 independent experiments. *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001, 2-way ANOVA, Tukey multiple comparison test. (C) IL-2 secretion of CD4+ and CD8+ T cell subsets. Data are mean ± s.d., n=12 across 5 independent experiments. *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001, 2-way ANOVA, Tukey multiple comparison test.