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![[Figure 1]](ba5261fig1mag.jpg)
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Figure 1
Comparison of (a) the classical `Watson–Crick' G–C base pair with (b) a G–T base pair that guanine can make when it adopts a less stable enol tautomer (dashed arrows from hydrogen-bond donor to acceptor) (Topal & Fresco, 1976  ). Marvin was used to draw chemical structures (https://www.chemaxon.com). |
![[Figure 1]](ba5261fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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