L-selenocysteine + 2-oxobutanoate + NH4(+) => L-selenocystathionine + H2O
l-selenocysteine + 2-oxobutanoate + nh4(+) => l-selenocystathionine + h2o
L-selenocysteine + 2-oxobutanoate + NH4(+) => L-selenocystathionine + H2O
l-selenocysteine + 2-oxobutanoate + nh4(+) => l-selenocystathionine + h2o