Short communicationOntogenesis of δ-opioid receptors in rat brain using [3H][D-Pen2,D-Pen5]enkephalin as a binding ligand
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∂-Opioid modulation of social interactions in juvenile mice weaned at different ages
2001, Physiology and BehaviorCitation Excerpt :In particular, weaning appears to be a critical element in initiating in the rat the transition from μ- to ∂-opioid receptor regulation of behavioral pain responses, in that such a transition can be delayed by between 5 and 10 days by delaying weaning age [15,17,26]. Actually, there is clear evidence that opioid receptor subtypes exhibit a divergent ontogeny, with μ-receptors appearing mostly prenatally in the brain and ∂-receptors developing up to the fourth postnatal week [21,29,36]. Such a delayed period of postnatal organization lends the ∂-system a high level of plasticity, allowing it to be open to early external influences.
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