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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Pain. 2010 Jun 22;150(3):401–413. doi: 10.1016/j.pain.2010.02.042

Figure 6.

Figure 6

μ opioid receptors are expressed by primary afferent C and Aδ nerve fibers and some microglia. (a) Confocal images of μ opioid receptor (green) and CD11b (red) immunofluorescence colocalization in microglial processes (arrows). (b) Confocal images of μ opioid receptor (green) and CD11b (red) immunofluorescence colocalization in microglial cell bodies (arrow heads). (c) Immunofluorescence images of μ opioid receptor (red) and CGRP (green) colocalization in afferent presynaptic nerve terminals (arrows). (d) Immunofluorescence images of μ opioid receptor (red) and NeuN (green) with no colocalization (open arrow heads). Scale bars equal 10 μm.