MmuPV1 viral transcripts were detected using RNAscope 2.5 HD Assay-Brown (Advanced Cell Diagnostics, Newark, CA) according to the manufacturer’s instructions (61 (link)) with probes specific for MmuPV1 E1^E4 (catalog no. 473281). Tissue sections were treated following protease treatment and prior to probe hybridization with 20 units of DNase I (Thermo Fisher Scientific; catalog no. EN0521) for 30 min at 40°C. Slides were counterstained with hematoxylin before mounting and coverslipping.
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