FCGR2B and infection: Likewise, during LCMV-clone 13 infection (Fig. 4f), the frequency and number of FcγRIIB+ cells were significantly increased among Fgl2−/− P14 as compared to among WT P14 in the blood (Fig. 4g, h), lymph node (Fig. 4i) and spleen (Fig. 4j).