Self-Association of a DNA Loop Creates a Quadruplex - Crystal- Structure of d(GCATGCT) at 1.8-Angstrom Resolution

G. A. Leonard, S. Zhang, M. R. Peterson, S. J. Harrop, J. R. Helliwell, W. B. T. Cruse, B. L. Destaintot, O. Kennard, T. Brown and W. N. Hunter. Structure 3 (4), 335-340, 1995.