Genotyping for EBNA3C subtypes and LMP1 gene deletion by PCR in eBL tumors and BL cell lines. A 153-bp band for type-A EBV and a 246-bp band for type B virus are shown. A 30-bp deletion at the carboxyl terminus of LMP1 gene is shown by the shorter PCR product of 205-bp, rather than a 235-bp band for the wild-type LMP1 gene.