Sex Chromosomes Do It Differently.

PLoS Biol · 2016 · PMC5063309 · PMID 27736902

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an interesting trendno p-value reported

While studying the distinct gene content of the mammalian X chromosome, authors of a PLOS Biology study noticed an interesting trend: genes residing on the X chromosome are disproportionately lowly expressed.

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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.