CD93 and cancer: Only splenic CD93+, but not CD93−, BMBP from tumor-bearing mice generated B-MF, while B cells from spleens of naïve mice failed to do so regardless of CD93 expression (Supplementary Fig. 7c and Supplementary Fig. 3f), implying that cancer accumulates CD93+ BMBP in the spleen and tumor11 to generate B-MF.