Confocal image of Purkinje cells in the cerebellum. The fluorescent image is made from native fluorescence of ChR2-eYFP expressed in climbing fibers and a red antibody to calbindin in Purkinje cells.
Source: Mathews, PJ et al. (2012) Effects of Climbing Fiber Driven Inhibition on Purkinje Neuron Firing. Full Article.