... i.e. 208 and 222 nm (a helix signature),218 nm (b strand signature), 202–204 nm (random coilsignature). In WhiB5 and WhiB6, the structure wasdominated by a helices and b strands and the propor-tion ... refolding were 98% pure and werebrownish (Figs S1 and S2).The presence of four conserved cysteines and thebrownish appearance of purified WhiB1, WhiB2,WhiB5, WhiB6 and WhiB7 indicated the ... inWhiB6 and WhiB7 the loss was 8–10%. After 48 hof air exposure, losses were as follows: 80% inWhiB1, 75% in WhiB2 and WhiB5, 65% inWhiB3, 60% in WhiB4, and 35–40% in WhiB6 and WhiB7...