Immunohistochemistry shows positive staining for measles receptors in CTCL lymphoma biopsies. Red staining represents lymphocytes that express respective receptor (A) CD46 and (B) CD150. Stainings were performed on cryostat sections and were assessed together with contiguous slices stained for CD4 and CD8. Original magnification, × 100 (scale bar indicates 100 μm). Images were visualized under an Axiophot light photomicroscope (Zeiss, Jena, Germany) equipped with a 10 × objective lens and a 10 × ocular.