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CTLA-4 antibody blockade precipitates a sarcoidosis-like pathology. (Top Left) Involved hilar lymph node (H&E). (Magnification: ×4.) (Top Right) Noncaseating granulomas (H&E). (Magnification: ×10.) Immunostains: S100, CD68, CD3, and FoxP3 (Magnification: ×20).
