The i-motif in the bcl-2 P1 promoter forms an unexpectedly stable structure with a unique 8:5:7 loop folding pattern.
Kendrick S, Akiyama Y, Hecht SM, Hurley LH. The i-motif in the bcl-2 P1 promoter forms an unexpectedly stable structure with a unique 8:5:7 loop folding pattern. J Am Chem Soc. 2009 Dec 09; 131(48):17667-76.