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The mammalian circadian clock is located in the suprachiasmatic nucleus (SCN) of the anterior hypothalamus. The SCN is situated at the base of the brain directly above the optic chiasm (oc) and surrounding the third ventricle (3V). The image depicts a low-power photomicrograph of the SCN of a Syrian hamster (Mesocricetus auratus) stained immunohistochemically for FOS protein as previously described (Gibson et al., 2008). Arrows point to the lateral borders of the SCN.
