Effect of IL-13Rα1 deficiency on Hb1 and Hb2 infection-induced development of M2. (A) Arginase-1 (Arg1) mRNA expression. (B) CD206 mRNA expression. (C) Ym1 mRNA expression. *, P < 0.05, and **, P < 0.01, compared to WT VEH; ϕ, P < 0.05, compared to respective WT Hb1 or Hb2 infection. n = 4 to 7 per group.