hydrogen sulfide + pyruvate + NH4(+) + H(+) => D-cysteine + H2O
hydrogen sulfide + pyruvate + nh4(+) + h(+) => d-cysteine + h2o
hydrogen sulfide + pyruvate + NH4(+) + H(+) => D-cysteine + H2O
hydrogen sulfide + pyruvate + nh4(+) + h(+) => d-cysteine + h2o