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. 2019 Mar 8;10:66. doi: 10.3389/fgene.2019.00066

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Copyright © 2019 Corona-Ruiz, Hernandez-Cabrera, Cantú-González, González-Amezcua and Javier Almaguer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Chemical structure of DNA. Adenine, guanine, cytosine, and thymine are shown in colors green, blue, red, and purple, respectively. Notice the double-ring structure of the purines (A, G) and the single-ring structure of the pyrimidines (C, T). Similarly, the type of bond is readily observable: double- and triple-Hydrogen bonds for A, T and G, C, respectively. This illustration, by Madeleine Price Ball, has a Creative Commons Zero (CC0, i.e., “No Rights Reserved") license and has been published in previous articles (Wikimedia Commons Contributors, 2018).