Whole BM cells were isolated from femurs and tibias according to methods described elsewhere (16 (link)). A total of 3 × 106 live BM cells were blocked using a rat anti-mouse CD16/32 antibody (BD Pharmingen) and stained with PE-Cy5 conjugated anti-mouse CD3e (clone: 145–2C11), PE-Cy5 conjugated anti-mouse CD4 (clone: GK1.5), PE-Cy5 conjugated anti-mouse CD8 (clone: 53–6.7) PE-Cy5 conjugated anti-mouse B220 (clone: RA3–6B2), PE-Cy5 conjugated PE-Cy5 conjugated anti-mouse CD11b (clone: M1/70), PE-Cy5 conjugated anti-mouse Gr-1 (clone: RB6–8C5), PE-Cy5 conjugated anti-mouse Ter119 (Ly-76), PE conjugated anti-mouse Sca1 (clone: D7), APC conjugated anti-mouse cKit (clone: 2B8), FITC conjugated anti-mouse CD45.2 (clone: 104; eBioscience) and APC-eFluor780 conjugated anti-mouse CD45.1 (clone: A20; e eBioscience). All antibodies were diluted 1:400. Data were collected from at least 500,000 single cells using FACSCanto (BD Pharmingen) and analyzed using FlowJo (Tree Star Inc.) without knowledge of the genotype or treatment by a single observer (C-LL).