PCR for LMP gene.

(A) Strain typing for EBV using EBNA-2 primers demonstrates strain type A in all cases. (B) PCR analysis of the LMP-1 gene shows wild-type gene product (WT, 161 bp) in cases 1, 2, 6, 4. A deleted LMP-1 gene product (del, 131 bp) is noted in case 3; n indicates negative control).