Upon flow analyses of the draining lymph node (Supplemental Figure 3C), spleen (Supplemental Figure 3D), and tumor (Figure 2A) of these mice on day 14, we found significantly increased frequencies of FcγRIIB+ cells among CD44hiCD8+ T cells in Fgl2–/– mice compared with WT mice. Here, FCGR2B is linked to neoplasm.