Total-body imaging of mu-opioid receptors with [<sup>11</sup>C]carfentanil in non-human primates.

The visual cortex was the only region showing a trend of naloxone blockade (baseline DVR = 1.2 ± 0.1 and naloxone pretreatment DVR = 1.0 ± 0.1) that did not reach statistical significance (Fig. 2 c).

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