Figure 4: Mutational screening of exons 1 and 2 of B2M across 24 FLs and 23 DLBCLs identified A) a novel monoallelic Δ12bp (77-88 bp) with an insT (76-77 bp) in a DLBCL patient and B) a ΔCT (98-99 bp) in another DLBCL case.