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Stereo views of x-ray subtype (A) DIS (PDB code 1XPF) and subtype (B) DIS (PDB code 1XPE) structures with x-ray Mg2+ ions and (C) stereo view of subtype F DIS (PDB code 1ZCI) with x-ray K+ ions. Final positions of ions were obtained from the last nanosecond, and are represented by unfilled spheres.
