Figure 5.

Thiol reactivity of the clusters. Clusters (10 μM) were incubated with DTNB (4 μM) in 0.2 M Tris⋅HCl, pH 7.4, and 25°C, and the reactions were followed spectrophotometrically (412 nm). (Inset) First-order replot of the data. □, α-Domain; ■, β-domain.