... biochemical and biophysical properties of WhiB2, WhiB5, WhiB6 and WhiB7 of M. tuberculosis and also compare the prop-erties of all seven WhiB proteins. We show that, simi-lar to WhiB3 and WhiB4, ... 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...