1A4A:
reference: Rack-induced metal binding vs. flexibility: Met121His azurin crystal structures at different pH., Messerschmidt A, Prade L, Kroes SJ, Sanders-Loehr J, Huber R, Canters GW, Proc Natl Acad Sci U S A 1998 Mar 31;95(7):3443-8. PMID: 9520385

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