Neuropeptide receptors in the brain -

This confocal microgaph captures normal brain tissue from the thalamus stained with antibodies to receptors for orexin (green).

Orexins are molecules that help keep us awake and alert, and may also stimulate the appetite. They are produced in the hypothalamus and act through their receptors located in the nuclei of cells in many different parts of the brain.

The red stain highlights the neurofilaments and the blue stain, the nuclei.