The spleens were harvested from the mice (n = 4 per genotype). Cells were released by pressing the spleens under sterile metal screens and erythrocytes were lysed in cold ammonium chloride-based buffer. Fc receptors were blocked with TruStain FcX anti-mouse CD16/CD32 (cat# 101320; BioLegend, San Diego, CA), and surface antigens were stained with fluorescence-labeled antibodies to mouse CD3, CD4, CD8, B220/CD45, IgM, CD21/35, CD23, CD19, and CD138 (Additional file 2). Data acquisition and analysis were performed as before [28 (link)] using a FACSCanto II instrument and BD FACSDiva software (version 5.0).
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