2.8.1.9 0.05 - L-cysteine for the L-cysteine desulfurase domain, 2 mM DTT, pH 9.3, 37°C 665687 2.8.1.9 0.2 - L-selenocysteine for the L-cysteine desulfurase domain, 2 mM DTT, pH 9.3, 37°C 665687