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. 2017 Jan 7;18:50. doi: 10.1186/s12864-016-3470-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 1 — Pie chart that depicts the percentage of number of reads in different alignment categories: miRNA (include isomiR), tDR, osRNA, other mapped reads, unmapped. For any sRNA sequencing project on tissue, the unmapped rate will be at least 50%. The unmapped rate will be even higher for extracellular sRNA sequencing because low sRNA content in serum