English: The interactions between TBA and ions. (A) TBA-potassium ion complex. Potassium ion fits the cavity between the two G-tetrad planes of TBA properly and coordinately interacts with eight O6 atoms in G-quadruplex. (insert: the whole structure of TBA-K+ complex) (B) TBA-sodium ion complex. Two alternative positions of sodium observed, and sodium can only interacts with four rather than eight oxygens.
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