The Circular Dichroism spectra of 5 μM RS-S-EP36-S-SR′ (solid line), HS-S-EP36-S-SH (dotted line), and Cu2+-phenanthroline oxidized HS-S-EP36-S-SH (dashed) in 0.5 M NaPi, pH = 7.2 buffer at 25 °C. A 0.2 cm path 1 mL volume quartz cuvette containing 600 μL of solution was used. Scans were recorded at data pitch = 1 nm, bandwidth = 2 nm, and at a speed of 20 nm.min−1.