VDJ-IgH PCR analysis of DNA samples from lymphoma tissues of SIV-infected monkeys. Lanes 1 through 4 are from monkeys 4, 208, OD5, and 8503, respectively. A spontaneous nasal non-Hodgkin's B-cell lymphoma from uninfected monkey (lane 5), Rajii cells (lane 6), SL-691, an in vitro established Simian Lymphoblastoid B-cell line (lane 7), and monkey PBMC (lane 8) were also included as controls.