Age- and gender-matched normal B6 mice received every other day intraperitoneal (ip) injections of PBS, 1.5 μg rmIL-4, 50 μg anti-IL-4 mAb (11B11 or MAB404), or a mixture of 1.5 μg rmIL-4 plus 50 μg anti-IL-4 mAb (11B11 or MAB404) for 7 d.