2BBH:
reference: Crystal structure of the CorA Mg2+ transporter., Lunin VV, Dobrovetsky E, Khutoreskaya G, Zhang R, Joachimiak A, Doyle DA, Bochkarev A, Maguire ME, Edwards AM, Koth CM, Nature. 2006 Apr 6;440(7085):833-7. PMID: 16598263

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