Agarose gel of representative PCR results on fresh BM core biopsy samples. KS330₂₃₃ is amplified from the DNA from patients with myeloma (lanes 1, 3, 5, and 7), but not from normal individuals (lanes 9, 11, and 13). Even-numbered lanes represent the β-actin controls (650 bp product) for each of the preceding odd-numbered lanes, respectively. Placental DNA is the negative control (lane 15), and DNA from the KSHV-infected cell line KS-1 is the positive control (lane 16). M, 123-bp molecular-weight marker.