3T6F:
reference: Second Contact Shell Mutation Diminishes Streptavidin-Biotin Binding Affinity Through Transmitted Effects on Equilibrium Dynamics., Baugh L, Le Trong I, Cerutti DS, Mehta N, Gulich S, Stayton PS, Stenkamp RE, Lybrand TP, Biochemistry. 2011 Dec 6. PMID: 22145986

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