STAT6 and allergic disease: Concomitantly, Th9 and, partially, Th2 cells—revealed by Stat6 expression and STAT5 phosphorylation (Supplementary Fig. 1b,c)—were decreased in both infection and allergy (Fig. 2d,e), while Th17 and Treg cells were unaffected and Th1 cells increased (Supplementary Fig. 3a,b).