Co-expression of GRK2 reveals a novel conformational state of the µ-opioid receptor.

PLoS One · 2013 · PMC3869807 · PMID 24376730

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a slight trendno p-value reported

There was no significant change in agonist potencies between the two preparations, although there was a slight trend for a lower value in the presence of GRK2.

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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.