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. 2003 May 15;31(10):2671–2682. doi: 10.1093/nar/gkg350

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Loose binding of Ba²⁺ ions. (a) Poorly occupied binding sites for barium cations in the subtype-A DIS duplex. The anomalous difference map contoured at 4.5 σ above mean level is shown in green. (b) Ba²⁺ binding sites in the subtype-B DIS duplex. Three poorly occupied sites (depicted as Ba2^a, Ba2^b and Ba2^c) lie in the major groove, whereas the Ba1 site is stronger and better localized in an internal bulge region. The anomalous difference map contoured at 6.0 σ above mean level is shown in green.

Loose binding of Ba²⁺ ions. (a) Poorly occupied binding sites for barium cations in the subtype-A DIS duplex. The anomalous difference map contoured at 4.5 σ above mean level is shown in green. (b) Ba²⁺ binding sites in the subtype-B DIS duplex. Three poorly occupied sites (depicted as Ba2^a, Ba2^b and Ba2^c) lie in the major groove, whereas the Ba1 site is stronger and better localized in an internal bulge region. The anomalous difference map contoured at 6.0 σ above mean level is shown in green.