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Expression of cytokines in milk by biotin-streptavidin immunocytochemistry method: (a) TNF-α, 100x; (b) TNF-α, 400x; (c) IL-1, 400x; (d) IL-10, 400x; (e) BD-2, 400x; (f) caspase-6, 400x. The brown colour in the cytoplasm and cell nuclei indicates a positive presence of cytokines.
