1ZIO:
reference: Crystal structures of Bacillus stearothermophilus adenylate kinase with bound Ap5A, Mg2+ Ap5A, and Mn2+ Ap5A reveal an intermediate lid position and six coordinate octahedral geometry for bound Mg2+ and Mn2+., Berry MB, Phillips GN Jr, Proteins 1998 Aug 15;32(3):276-88. PMID: 9715904

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