May-Grünwald-Giemsa–stained cells derived from (A) MACS-selected 97A6⁺ PB cells (positive enrichment), (B) StemSep (basophil kit)–selected PB cells (negative enrichment), (C) StemSep (basophil kit)–selected PB cells from a patient with accelerated phase CML, and (D) FACS-sorted 97A6⁺IgE⁺ BM cells.