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. 2016 Nov 28;11:45. doi: 10.1186/s13013-016-0105-8

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© The Author(s). 2016

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. 2 — Example of a single nucleotide variation (SNV). Upper part: DNA sequence illustrating two possible alleles at a specific point in the genome. This type of variation is called single-nucleotide variation (SNV). Lower part: the resulting three possible genotypes. Artwork: Elísabet Einarsdóttir