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. Author manuscript; available in PMC: 2012 May 16.
Published in final edited form as: Behav Brain Res. 2010 Dec 13;219(1):15–22. doi: 10.1016/j.bbr.2010.12.003

Figure 4.

Figure 4

Photomicrographs illustrating mu-opioid receptor labeling. Representative images include POM (top) and PVN (bottom) in males without (left) and with (right) nest boxes. Scale bar at the bottom right box is approximately .005mm.