0 -> AcCoA
AcCoA -> 0
HOAc <-> HOAc_E
AcCoA -> AcP
AcP <-> OAc
OAc -> AcCoA
OAc <-> HOAc
0 -> LacI
0 -> Acs
0 -> Pta
LacI -> 0
Acs -> 0
Pta -> 0