Analysis of hematopoietic progenitors from P1. Flow cytometric analysis of BM cells of patient P1 at age 2.3 months. Cells were stained with CD38-FITC, CD34-APC, CD110-PE (or PE-labeled isotype control), and 4',6-diamidino-2-phenylindole as a viability marker. Gated on viable nucleated cells (A) and on CD34⁺CD38^lo cells (B). Red indicates isotype control; blue indicates CD110 (MPL).