Bone marrow engraftment analysis 2 months before clinical recurrence. Shown are capillary electropherograms of PCR amplification products for a single chromosome 7 short tandem repeat marker (D7S820). A fractionated peripheral blood sample is shown. Whole, CD3+, and CD15+ denote an unfractionated sample, a CD3 selected whole blood fraction (T-cells), and a CD15 selected whole blood fraction (myeloid cells), respectively. Below each peak, the number of repeats and integrated fluorescence intensity are provided.