A review of the phytochemical support for the shifting defence hypothesis.

Phytochem Rev · 2011 · PMC3047680 · PMID 21475397

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The sentences

a clear trendno p-value reported

Digestibility reducers did not show a clear trend which might be due to the small number of studies and traits measured.

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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.