¹³¹I-anti-CD45 antibody localization. Posterior ¹³¹I-BC8 images of patient with AML in relapse (UPN 9013) immediately after trace-labeled antibody infusion (A and C) and 40 hours after infusion (B and D). Accumulation of labeled antibody is shown in the ribs, vertebral column, ilium, pelvis, and sacrum, all marrow-rich regions of the axial skeleton.