Headgroup-dependent membrane catalysis of apelin-receptor interactions is likely.

J Phys Chem B · 2009 · PMC2736645 · PMID 19708686

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a clear trendno p-value reported

In contrast, a clear trend in peak attenuation is observed with the titration of apelin-17 by Mn 2+ .

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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.