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. 2016 Jan 4;11(1):e0146174. doi: 10.1371/journal.pone.0146174

Fig 1. Examples of topology classes of G-quadruplex structures within genomic DNA.

Fig 1

Examples of topological configurations of intrastrand and interstrand quadruplexes are shown schematically. For pairs of topology types that differ only by strand from which the sequence is derived (e.g. ABAB and BABA) only one is shown. Black, green—the Watson and Crick strands. Red: guanines, blue: cytosines, yellow: loops of up to seven nucleotides of any type. AAAA—the intrastrand topology, AABB, ABAB, ABBA, ABBB, BABB: interstrand configurations.