1. ε at 260 nm and pH7.5: (18.0 ± 1.3) x 103L.mole-1.cm-12. ε when reduced with G6PDH* at 340nm and pH7.5:(6.2 ± 0.6) x 103L.mole-1.cm-13. Ratios at pH 7.5: A250/A260 (0.83 ± 0.08)A280/A260 (0.21 ± 0.02)4. Ratio when reduced with G6PDH* at pH 7.5:A340/A260 (0.43 ± 0.04)