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Central administration of oxytocin has been shown to induce yawning, penile erection, grooming and scratching. Yawning and penile erections are due to activation of oxytocinergic neurons in the paraventricular nucleus of the hypothalamus. We selectively bred two sublines from Sprague-Dawley rats, one with a high-yawning frequency (HY) of 20yawns/h, and one(More)
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