Cerebellar Purkinje neurons, 2003. This photomicrograph shows a portion of the cerebellum in which only one type of neuron — its Purkinje cells — has been illuminated by a genetically encoded fluorescent protein; meanwhile, other classes of neighboring neurons that would have clouded the view have been left invisible.
Credit: Aric Agmon
Portraits of the Mind: Visualizing the Brain From Antiquity to the 21st Century,”