The structure of the caspase recruitment domain of BinCARD reveals that all three cysteines can be oxidized.
Chen KE, Richards AA, Caradoc-Davies TT, Vajjhala PR, Robin G, Lua LH, Hill JM, Schroder K, Sweet MJ, Kellie S, et al. Acta Crystallogr D Biol Crystallogr. 2013 May; 69(Pt 5):774-84. Epub 2013 Apr 11.