Circulating TRAIL shows a significant post-partum decline associated to stressful conditions.

PLoS One · 2011 · PMC3237411 · PMID 22194780

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did not reach statistical significanceno p-value reported

Interestingly, elevated levels of total cortisol were associated with low levels of TRAIL also in the CB although this association did not reach statistical significance.

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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.