Fig. 2

DLL4 is expressed in CLL lymph nodes. Immunofluorescence staining of tonsils and CLL LN with anti-CD68 (green) and anti-DLL4 (red). Nuclei were stained with Topro-3 (blue). White arrows indicate representative CD68+/DLL4+ cells. Pictures were taken at ×63 magnification in a confocal microscope. Images from a representative case per group are shown (CLL 11 and 19)