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. Author manuscript; available in PMC: 2008 Jun 29.

Published in final edited form as: Neuroscience. 2007 May 31;147(2):456–468. doi: 10.1016/j.neuroscience.2007.03.053

Distribution of PAG-RVM output neurons that expressed morphine-induced Fos in male and female rats across six rostrocaudal levels of the PAG. Each black circle represents one double-labeled (Fos+FG) cell. Bar graphs display the mean number of Fos+FG cells (± S.E.M.) for each level of the dorsomedial and lateral/ventrolateral regions of the PAG. Fos labeling was greater in male than female rats in all PAG regions measured.

Distribution of PAG-RVM output neurons that expressed morphine-induced Fos in male and female rats across six rostrocaudal levels of the PAG. Each black circle represents one double-labeled (Fos+FG) cell. Bar graphs display the mean number of Fos+FG cells (± S.E.M.) for each level of the dorsomedial and lateral/ventrolateral regions of the PAG. Fos labeling was greater in male than female rats in all PAG regions measured.