Necrotic_or_Serpin -| Spaetzle
Spaetzle -> Toll
Toll -> MyD88
MyD88 -> Tube
Tube -> Pelle
Pelle -| Cactus
Supernumary_limbs -| Cactus
Cactus -| Dif
Cactus -| Dorsal
Dif -> target_genes
Dorsal -> target_genes
$Cactus: (!Pelle | (Pelle & !Supernumary_limbs))
$Dif: !Cactus
$Dorsal: !Cactus
$MyD88: Toll
$Pelle: Tube
$Spaetzle: !Necrotic_or_Serpin
$Toll: Spaetzle
$Tube: MyD88
$target_genes: ((!Dif & Dorsal) | Dif)