Interspecific studies of circadian genes period and timeless in Drosophila.

Gene · 2018 · PMC5818170 · PMID 29353056

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an overall trendno p-value reported

An overall trend toward shortening of period under 18 °C was seen in the controls (both natural and transgenic) and per ps transformant lines.

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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.