“…Receptor densities were estimated using PET tracer studies for a total of 18 receptors and transporters, across 9 neurotransmitter systems. These include dopamine (D 1 [59], D 2 [96,105,108,131], DAT [33]), norepinephrine (NET [8,22,31,95]), serotonin (5-HT 1A [98], 5-HT 1B [6,41,73,76,77,85,97,98], 5-HT 2A [9], 5-HT 4 [9], 5-HT 6 [87,88], 5-HTT [9]), acetylcholine (α 4 β 2 [6,52], M 1 [78], VAChT [1,7]), glutamate (mGluR 5 [32,106]), GABA (GABA A [80]), histamine (H 3 [42]), cannabinoid (CB 1 [34,79,81,93]), and opioid (MOR [60]). Volumetric PET images were registered to the MNI-ICBM 152 nonlinear 2009 (version c, asymmetric) template, aver-aged across participants within each study, then parcellated to 68 cortical regions.…”