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. 2017 Feb 8;7:41952. doi: 10.1038/srep41952

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Opioid blockade (Naltrexone condition, NTX) caused a decrease in (a) zygomatic and (b) corrugator muscle activity (*denotes p < 0.05, ***denotes p < 0.001). Error bars indicate standard error of mean. Precise p values given in text.