Identification of distinct subsets of DC precursors from pediatric patients recovering from Allo-HSCT. Top plots: sequential progressive gating of a population of large mononuclear myeloid cells, by combination of CD33 expression with light scatter parameters (SSC and FSC, as described in “Patients, materials, and methods”). Bottom plots: analysis of CD33⁺ mononuclear large cells from the gate selected in the top right plot, by 3-color counterstaining with CD14, CD16, and CD2.