Color-coded image of dopamine (D₂) and serotonin (S₂) receptors in brain. These receptors are revealed by the binding of [³H]spiroperidol to a thin horizontal slice of rat brain. An autoradiograph results from exposing the brain slice to tritium-sensitive film. Differing gray tones of the developed film are color-coded, whereby increasing amounts of [³H]spiroperidol binding are represented by black, blue, green, yellow, and red. [³H]Spiroperidol principally labels S₂ receptors in the neocortex and D₂ receptors in the striatum. See page 597. [Photograph prepared using the image analysis facility of the LASER Microbeam Program, University of California, Irvine. Image preparation and photography by J. N. Joyce]

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