a, Measurements of expression of MHC class II in different mouse organ cells. b, Comparison of 209Bi- and 176Yb-tagged MHC class II antibodies in scaffold maps, revealing immune organization of the bone marrow for C57BL/6 mice. Red nodes denote landmark manually gated cell populations; blue nodes present unsupervised cell clusters from the same data. Data in left panel of b from ref.9. gd T cells, γδ T cells; HSC, hematopoietic stem cell; mDCs, myeloid dendritic cells; NK, natural killer; NKT, natural killer T; pDCs, plasmacytoid dendritic cells.