From The Cell Image Library - http://cellimagelibrary.org/home "Confocal image of synaptic connexions in the mouse olivo-cerebellar system. Purkinje cells (immuno fuorescence, blue), olivary axons (anterograde tracing, yellow) and synaptic terminals (immunofluorescence, red) are shown, revealing the highly specific organization of neuronal connexions in the mouse cerebellum." Photo by Mathieu Letellier