Fgf8 -| Emx2
Coup_fti -> Emx2
Pax6 -| Emx2
Sp8 -| Emx2
Emx2 -| Pax6
Coup_fti -| Pax6
Sp8 -> Pax6
Fgf8 -| Coup_fti
Sp8 -| Coup_fti
Fgf8 -> Fgf8
Emx2 -| Fgf8
Sp8 -> Fgf8
Fgf8 -> Sp8
Emx2 -| Sp8
$Coup_fti: (!(Fgf8 | Sp8) | !(Fgf8 | Sp8))
$Emx2: (Coup_fti & !((Fgf8 | Sp8) | Pax6))
$Fgf8: ((Fgf8 & Sp8) & !Emx2)
$Pax6: (Sp8 & !(Coup_fti | Emx2))
$Sp8: (Fgf8 & !Emx2)