IL4 and asthma: However, the levels of type-2 cytokines, such as IL-4 (10–25 pg/ml), IL-5 (10–16 pg/ml), and IL-13 (30–70 pg/ml), were enhanced in response to the type-2 high model compared to the type-2 low asthma model (0.5–3 pg/ml, 1–4 pg/ml, and 2–8 pg/ml, respectively) (Fig 3C–3E).