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Immunocytochemistry of IL-8 protein in eosinophils. (a) Spontaneous expression of IL-8 protein in the cytoplasm as detected by using a mouse anti-IL-8 MAb. (b) Eosinophils incubated with 5-μg/ml erythromycin showed distinct positive staining for IL-8 protein. Original magnification, ×200.
