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. 2007 Aug;26(4):943–952. doi: 10.1111/j.1460-9568.2007.05716.x

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© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd

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Fig. 4 — Effects of activation in the periaqueductal grey (PAG) on spinal Fos-like immunoreactivity. Photomicrographs of Fos-like immunoreactivity in response to fast (A and B) and slow (C and D) rates of skin heating in the absence (A and C) and presence (B and D) of evoked descending control from the ventrolateral PAG.