a, Examples of growth of intestinal organoids in elastic versus viscoelastic hydrogels over 7 days. Phalloidin in cyan, Hoechst in magenta. Scale bar is 100 μm. b, Quantification of organoid circularity in different stiffness elastic and viscoelastic hydrogels. n=32,32,38,37 organoids per condition. Statistical analysis was performed using Kruskal–Wallis test followed by post hoc Dunn’s test. Data represent mean ± s.d.