Means ± SEM of (E) percent mucus gland filling, (F) skin Bd loads, (G) epidermal thickness, and (H) mpo-positive neutrophils, per field of view of r-ctrl- or rIL4-administered, mock- or Bd-challenged frog skins 21 days post infection (dpi) (N = 7). This evidence concerns the gene MPO and infection.