3WZO:
reference: Structure-based design of a streptavidin mutant specific for an artificial biotin analogue., Kawato T, Mizohata E, Shimizu Y, Meshizuka T, Yamamoto T, Takasu N, Matsuoka M, Matsumura H, Kodama T, Kanai M, Doi H, Inoue T, Sugiyama A, J Biochem. 2015 Feb 2. pii: mvv004. PMID: 25645976

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