Southern blot analysis of DNA extracted from tumors (7, 150, 885, and 980) and normal placenta with MYC, REL,BCL2, and D2S48 probes. The calculated copy numbers are listed. Tumor 150 exhibited amplification of 2p12-16 (REL) and 18q21-22 (BCL2), and tumor 885 exhibited amplification of 8q24 (MYC) by CGH.