PBMCs were isolated according to methods described elsewhere (16 (link)). PBMCs were blocked using a rat anti-mouse CD16/32 antibody (BD Pharmingen) and stained with FITC conjugated anti-mouse CD45.2 (clone: 104), APC-eFluor780 conjugated anti-mouse CD45.1 (clone: A20), PE conjugated anti-mouse B220 (clone: RA3–6B2), PE-Cy5 conjugated anti-mouse CD11b (clone: M1/70) (all acquired from eBioscience) and Brilliant Violet 421 conjugated anti-mouse CD3e antibodies (clone: 145–2C11; BioLegend). All antibodies were diluted 1:400. Data were collected from at least 20,000 single cells by FACSCanto (BD Pharmingen) and analyzed using FlowJo (Tree Star, Inc) without knowledge of the genotype or treatment by a single observer (C-LL).