4U9N:
reference: Structural basis for ion selectivity revealed by high-resolution crystal structure of Mg(2+) channel MgtE., Takeda H, Hattori M, Nishizawa T, Yamashita K, Shah ST, Caffrey M, Maturana AD, Ishitani R, Nureki O, Nat Commun. 2014 Nov 4;5:5374. doi: 10.1038/ncomms6374. PMID: 25367295

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