Cytology and FC of SLL/CLL. a Smear showing a monomorphous population of small lymphocytes. Nuclei have granular chromatin, membrane irregularities, and occasional small nucleoli. Diff-Quik stain. ×430. b-e FC histograms showing CD5/CD19 coexpression(b), CD23/CD19 coexpression(c), λ light chain restriction(d), and CD19/CD38 coexpression(e).