In the Epstein-Barr virus BamHI E genomic fragment, there are three distantly homologous long open reading frames, BERF1, BERF2b, and BERF4, each of which is preceded by a short open reading frame. The most leftward and most rightward short and long open reading frame pairs encode 145- and 155-kilodalton proteins in latently infected cells (EBNA3A and EBNA3C, respectively). In this report, we demonstrate that the middle long open reading frame, BERF2b, encodes part of a 165-kilodalton nuclear protein in every latently infected cell. Therefore, this protein is designated EBNA3B
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