ASO-PCR on PBSC harvest, purified CD34⁺Thy₁⁺ Lin⁻ cells and posttransplant BM in three patients (A, B, and C). The first 4 or 5 lanes represent the dilution curves for each patient. The subsequent lanes represent DNA from unsorted as well as purified CD34⁺ Thy₁⁺ Lin⁻cells. The last lane shows the degree of tumor contamination in the posttransplant BM.