Thyroid hormone signalling genes are regulated by photoperiod in the hypothalamus of F344 rats.

PLoS One · 2011 · PMC3120865 · PMID 21731713

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failed to reach statistical significanceno p-value reported

Surprisingly, in this study only a small rise in T3 after 3d was observed, which failed to 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.