Gel of VDJ-Ig-PCR amplimers of lymphoma tissues from SIV-infected monkeys. Lanes 3 and 5 correspond to oligoclonally rearranged lymphomas. Lanes 1, 2, 4, 6, 7, 8, and 9 show monoclonal rearrangements as well as lane 10 that contains DNA from the sARL-derived cell line SL-C18. Lanes 11 and 12 are DNA from tissue controls. Lane 11 corresponds to a tumor-free lymph node from one of the animals that developed lymphoma and lane 12 to a nonlymphoid tissue (kidney) from the same animal. The variable intensity of the bands displayed in this gel appears to be related to a variable amount of nontumor cells in each lymphoma case.