Frequency of IGHV genes in CLL-like MBL cases. (A) The diagram shows the relative frequency of each IGHV gene in CLL-like MBL cases, CLL patients, CD19⁺ CD5⁻ lymphocytes in the elderly and IgM⁺ B lymphocytes, ranked based on the usage in CLL-like MBL. (B) Frequency of IGHV genes in mutated CLL as compared with mutated CLL-like MBL.