Despite a similar decrease (to that seen in males) in FcγRIIb levels on GC B cells of female FcγRIIbΔAP-1 mice compared with control littermates (Figure VIIA in the online-only Data Supplement), there was no difference in proportions of GC B cells (Figure VIIB in the online-only Data Supplement), total IgG2c (Figure VIIC in the online-only Data Supplement), or total IgM (Figure VIID in the online-only Data Supplement), and consequently no difference in atherosclerosis (Figure VIIE in the online-only Data Supplement). Here, FCGR2B is linked to atherosclerosis.