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. 2020 May 22;48(13):e74. doi: 10.1093/nar/gkaa426

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© The Author(s) 2020. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Definition of various types of DSSR blocks, illustrated using idealized, planar Watson-Crick (WC) base-pair and G-tetrad geometries. (A) Purine (A, G) and pyrimidine (C, T, U) base blocks and the WC-pair block in default dimensions. The standard base reference frame is attached, and the minor-groove edge is marked. (B) The slim purine (guanine) block and the square G-tetrad block for simplified visualizations of G-quadruplexes. The slim pyrimidine block is of dimension 4 Å-by-3.5 Å. All blocks have a thickness of 0.5 Å by default. This figure and the following ones were annotated using Inkscape (https://inkscape.org).