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. 2021 Oct 14;22:291. doi: 10.1186/s13059-021-02502-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Features of PAS sites. a Barplot showing the percentage of PAS sites annotated in the PolyA_DB 3 database [47]. b Cumulative density of the number of identified PAS sites identified. c Barplot representing the genic location—3′ and 5′ UTRs, introns, exons, and intergenic regions—of PAS sites as defined by HOMER [48] (left), and the genomic locations of PAS sites defined using ChromHMM annotations [49] (right). For the latter, the four annotations represented are enhancer, promoter, repressed, and transcription (txn) elongation. Eleven other annotations were collapsed together as "Other" (see the “Methods” section)