Intravascular monocyte–neutrophil interactions in an uninflamed glomerulus-intact kidney. Movie of a glomerulus in the intact kidney of an untreated 3-wk-old Cx3cr1GFP/+ mouse. Neutrophils (red, labeled with anti–Gr-1-PE) can be seen undergoing interactions with GFP+ monocytes (green) within glomerular capillaries (blue, labeled with Qtracker-655). (Multiphoton microscopy; duration in real time, 9 min, 30 s). (Scale bar: 10 μm.)