1PQ4:
reference: Structural determinants of metal specificity in the zinc transport protein ZnuA from synechocystis 6803., Banerjee S, Wei B, Bhattacharyya-Pakrasi M, Pakrasi HB, Smith TJ, J Mol Biol 2003 Nov 7;333(5):1061-9. PMID: 14583199

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