CD19 and B-cell chronic lymphocytic leukemia: CLL-like phenotype:(A.1)Coexpression of CD5 with CD19, CD20low and CD23†(A.2)Light-chain restriction with low surface immunoglobulin expression (very small MBL clones may be oligoclonal and thus not light-chain restricted)†Atypical CLL phenotype:(B.1)Coexpression of CD5 with CD19, but CD20strong or CD23 negative†(B.2)Light-chain restriction with moderate/strong surface immunoglobulin expression†(B.3)Exclude t(11;14) to rule out mantle cell lymphomaNon-CLL phenotype :(C.1)CD5 negative†(C.2)Expression of CD20†(C.3)Light-chain restriction with moderate/strong surface immunoglobulin expression†