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a The fluorescence intensity of 3Cys-ΔC-templated Au NCs (black) and β-lactoglobulin-templated Au NCs (red) as a function of reacting time under basic conditions. b The two Au binding sites are located within four α-helix bundle of 3Cys-ΔC observed from side-view and top-view, respectively, and such a size-constrained microenvironment is necessary for preparation of Au NCs
