Specificity of the RT-PCR primers and oligonucleotide probes for EBER1, RPMS1, BARF0, and CD23. RT-PCR and Southern blot analysis were performed as described in Materials and Methods. Raji is a human EBV⁺ lymphoblastoid cell line that expresses RPMS1, BARF0 and human CD23. B95-8 is a marmoset lymphoblastoid cell line that expresses simian CD23 and carries an EBV genome that is deleted in the BamHI-I region, which encodes RPMS1.