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Immunohistochemistry of pulmonary SH by the labeled streptavidin-biotin peroxidase technique. Immunohistochemical stains showed both lining cells and round cells were positive for EMA (a, ×400) and TTF-1 (b, ×200). The lining cells were positive for CK (c, ×200), CK-7 (d, ×200) and PCK (e, ×200).
