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FAAH active site: On the left, the structure of the fatty acid amine hydrolase (FAAH). On the right, a 3D brain image of the effects of FAAH Pro129Thr (Pro129/Pro129 > Thr 129 carriers) on δ μ-opioid BPND after placebo administration during pain. For more info on this topic, please refer to the article by Peciñ a et al on pages 385–391.