IL-13 caused higher phosphorylation ratio of STAT6 than IL-4 in Meta1 gastroids. (A) Representative bright field images of Matrigel domes containing Meta1 gastroids treated with rIL-13, rIL-4, or vehicle solution (BSA). Quantitation of gastroid diameters showed significantly higher sizes in Meta1 gastroids treated with rIL-13 compared with rIL-4 and BSA starting at 2 days of treatment. There was no significant difference between rIL-4- and BSA-treated Meta1 gastroids. Scale bar: 1000 μm. Mean ± SD (N = 4 independent experiments). ∗P < .05, ∗∗P < .01, ∗∗∗P < .001, ∗∗∗∗P < .0001. (B) Immunoblotting shows significant up-regulation of phosphorylated STAT6 in Meta1 gastroids treated with rIL-13 when compared with rIL-4 and BSA. Mean ± SD (N = 4 independent experiments). ∗∗P < .01, ∗∗∗P < .001.