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. 2013 Jun 12;8(6):e66242. doi: 10.1371/journal.pone.0066242

Figure 1. TMPyP4, G-quartet, and G-quadruplex structures (A) The structure of the porphyrin TMPyP4 (B) The structure of G-quartets, adapted from [51] and an example of a G-quadruplex structure.

Figure 1

The sphere in the centre of the G-quartet represents a central cation.