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. 2015 Mar 10;16(1):164. doi: 10.1186/s12864-015-1390-y

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© Chen et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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The distribution of gene expression levels. Total reads from each of three libraries that match to the Populus gene models were plotted as integrated log₂ values. The distribution is based on the number of genes in each log₂ gene expression category (>0 and < =16). It revealed that most of the mRNAs are expressed at low levels, with a small proportion of mRNA that is highly expressed. Also, all three libraries have similar expression patterns.