Evolution of gene order conservation in prokaryotes.

Genome Biol · 2001 · PMC33396 · PMID 11423009

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highly significantno p-value reported

This disagreement probably arises because those studies did not include pairs of closely related species, and therefore missed the leftmost part of the graph, which is highly significant for the sigmoid shape.

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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.