Minced spleens and lymph nodes were passed through a 40μm strainer to get a single-cell suspension as described previously [16 (link), 47 (link)]. After lysis of red blood cells, the cell suspension was incubated with CD11b microbeads mouse / human (130-049-601, Miltenyi Biotec) for 15 minutes at 4°C. CD11b-positive cells were eluted from the beads using MACS® separation columns (130-042-201, Miltenyi Biotec) according to the manufacturer’s instructions and collected for subsequent RNA extraction.
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