O-succinyl-L-homoserine + L-cysteine => L,L-cystathionine + succinate + H(+)
o-succinyl-l-homoserine + l-cysteine => l,l-cystathionine + succinate + h(+)
O-succinyl-L-homoserine + L-cysteine => L,L-cystathionine + succinate + H(+)
o-succinyl-l-homoserine + l-cysteine => l,l-cystathionine + succinate + h(+)