Touch-induced face conditioning is mediated by genetic variation in opioid but not oxytocin receptors.

Sci Rep · 2018 · PMC5998070 · PMID 29899398

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highly significantno p-value reported

Whereas the OP AA genotype showed no development of conditioning across trials, the OP GG/AG genotypes demonstrated a highly significant development of conditioning of facial ratings across brushing trials 1–5.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.