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. Author manuscript; available in PMC: 2008 Sep 4.
Published in final edited form as: Behav Brain Res. 2007 Mar 25;182(2):290–300. doi: 10.1016/j.bbr.2007.03.022

Figure 1.

Figure 1

Reconstruction of the periaqueductal gray (PAG) tissue punch used in this study based on the atlas of Paxinos & Watson (1998). PAG was isolated by taking a circular punch (3 mm inner diameter) through the PAG from a transverse section of a coronal section of the brain cut from the anterior boundary of the superior colliculus to the posterior boundary of the junction between the inferior colliculus and the cerebellum.