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Staining of Myocardial Tissue
Hematoxylin and eosin (H&E) staining of myocardial tissue revealed no inflammatory cell infiltrates within the myocardium (A). Neutrophils and eosinophils were detected around the small blood vessels in association with obstruction at the vascular lumina (B). Immunostaining identified programmed cell death protein–1 (PD-1)–negative (C) and PD-1 ligand 1 (PD-L1)–positive (D) cells.
