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. 2018 Apr 18;8:6193. doi: 10.1038/s41598-018-24571-0

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© The Author(s) 2018

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Example of a Cited Statement (CS) and Primary Research (PR). The CS is shown in bold in the excerpt on the left. PR which is referred to by the CS, is shown on the right. The text in the image was taken from the seminal paper by Watson and Crick in 1953, entitled ‘A Structure of Deoxyribose Nucleic Acid’.