The ubiquitin-proteasome system is required for the early stages of porcine circovirus type 2 replication.

Virology · 2014 · PMC7127601 · PMID 24889239

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highly significantno p-value reported

Differences with a P value less than 0.05 were considered significant, and differences with a P value less than 0.01 were considered highly significant.

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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.