Representative results of Epstein-Barr virus–encoded RNA-1 in situ hybridization (EBER ISH). (A) positive EBER ISH; (B) negative EBER ISH. Images were captured using a Polaroid DMC2 digital microscope camera (Polaroid, Tokyo, Japan) and processed using Adobe Photoshop 7.0 (Adobe Systems, Seattle, WA). Original magnification, ×200.