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L1 protein was detected in the nuclei of cells of the back lesions. L1 capsid was stained in the back lesion with a polyclonal antibody (anti-group-specific antigen, GSA) and an in-house monoclonal antibody against MmuPV1 L1 (MPV.B9). Infected cells can be identified by the presence of L1 in the nuclei of the back lesion (a and b, 20×, and insert, 40×) and vaginally infected tissues (b and d, 4×, and insert, 20×) by immunohistochemistry.
