Fig. 4. The fluorescence quenching curves of EB (10 μM) bound to CT-DNA (60 μM) in the absence and presence of complex 1 (0–50 μM) in 5 mM Tris/50 mM NaCl buffer (pH 7.2). Inset: The plot of I₀/I versus the complex concentration with λ_ex = 490 nm.