Primary and promiscuous functions coexist during evolutionary innovation through whole protein domain acquisitions.

Elife · 2020 · PMC7790495 · PMID 33319743

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a clear trendno p-value reported

Intermediate steps in the construction of this mutant showed a clear trend toward attI x attI hyperactivity yet with some exceptions.

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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.