A quantitative measurement using theaveraged SUVR values of 17 brain ROIs: 2.43 ± 0.49 (baseline), 0.96± 0.23 (after acute CBD, with 60% reduction), and 0.68 ± 0.29(after acute WAY100635, with 72% reduction), suggest the specific binding of CBDto the 5-HT1A target. This evidence concerns the gene HTR1A and red-green color blindness.