Immunofluorescence for HHV-6 antigen expression was performed with a mouse monoclonal antibodies (mAb) directed against p41 and IE2 (early antigen) and glycoprotein gp116 (late antigen) of HHV-6 A and B (ABI, Columbia, MD, USA), as previously described [30 (link)]. Epithelial and stromal cells were respectively stained with mouse anti-Cytokeratin- 18, a heterotetramer cytoskeleton protein (CK18) and rabbit anti-vimentin, an intermediate filament of the cytoskeleton proteins moAbs (Abcam, Cambridge, UK), respectively. Nuclei were counterstained with DAPI (4,6-diamidino-2-phenylindole-dihydrochroride) (Sigma-Aldrich, S.Louis, MO, USA).
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