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Photomicrographs of renal biopsy sections. (A) Cytologic atypia of the tubular epithelial cells, including enlarged nuclei and large basophilic intranuclear viral inclusions (hematoxylin and eosin ×200). (B) Immunohistochemical staining reveals SV40 antigen (typical of BK virus infection) in the nuclear inclusions (×200).
