SI-CLP protein level is up-regulated in human macrophages by IL-4 and dexamethasone. Western blot analysis with 1C11 rat mAb shows individual differences in response to various stimulations. (A) Macrophages derived from donor 140.3 show strong up-regulation of SI-CLP under stimulation with IL-4 and dexamethasone. (B) Macrophages derived from donor 147.3 show intermediate-level SI-CLP up-regulation under stimulation with IL-4 and dexamethasone.