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Photomicrographs (400 x) showing Fos-IR in neurones found ipsilateral and contralateral to the microdialysis probe after aCSF or bicuculline (20 μm for 60 min) perfusion during the lights-off period. Filled arrow, HCRT+/Fos+ or MCH+/Fos+ neurone; star, HCRT+/Fos– or MCH+/Fos– neurone; open arrow, single Fos+ neurone.
