Autoradiograph results for patients P4, P6, and P42. The leukemic (L) and control (C) DNA was EcoR1 digested, size fractionated on 1% agarose gel, and hybridized with the following probes: (A) Control probe β-interferon; (B) p92c, with densitometry results of 0.94, 0.92, and 0.52, respectively, compared with the control signals showing homozygous retention, homozygous retention, and hemizygous loss, respectively; and (C) p25b, with densitometry results of 1.12, 0.92, and 0.57, respectively, compared with the control showing homozygous retention, homozygous retention, and hemizygous loss, respectively.