PTPRC and diffuse large B-cell lymphoma: We analyzed 11 Gα13-deficient mLN tumors histologically; 10 of 11 tumors showed expansion of sheets of large, atypical lymphocytes positive for the B cell marker B220, the GC marker GL7 lacking coincident staining of CD35+ follicular dendritic cell (FDC) meshworks consistent with DLBCL (Fig. 1c and Extended Data Fig. 1).