Fig. 4From: Engineering a diaphorase via directed evolution for enzymatic biofuel cell applicationCircular dichroism spectra of GsDI wild type and the mutants at a pH 5.0, b pH 5.4, c pH 6.0, d pH 7.3. Black line: WT; red line: mutant 1–8; blue line: mutant 2–12; green line: mutant 3–8Back to article page