3QBA:
reference: Reintroducing electrostatics into macromolecular crystallographic refinement: application to neutron crystallography and DNA hydration., Fenn TD, Schnieders MJ, Mustyakimov M, Wu C, Langan P, Pande VS, Brunger AT, Structure. 2011 Apr 13;19(4):523-33. PMID: 21481775

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