a thiol + pyruvate + NH4(+) => an S-substituted L-cysteine + H2O
a thiol + pyruvate + nh4(+) => an s-substituted l-cysteine + h2o
a thiol + pyruvate + NH4(+) => an S-substituted L-cysteine + H2O
a thiol + pyruvate + nh4(+) => an s-substituted l-cysteine + h2o