Morphologic changes showing features of apoptosis in B-CLL cell lines after treatment with melarsoprol for 24 hours (original magnification × 600). (A) Untreated WSU-CLL cells; (B) 10⁻⁸ mol/L melarsoprol-treated WSU-CLL cells; (C) untreated I83CLL cells; (D) 10⁻⁸ mol/L melarsoprol-treated I83CLL cells; (E) untreated JVM-2 cells; (F ) 10⁻⁸ mol/L melarsoprol-treated JVM-2 cells. The cells were stained using Giemsa-Wright stain.