Reaction state_transition re4181 map
GTP@neuron map + H2O@neuron map → DHNTP@neuron map
Reaction regulators:
Catalysis
  1. GCH1@neuron map
Inhibition
  1. tetrahydrobiopterin@neuron map
  2. GCH1:​GCHFR@neuron map
Trigger
  1. L-phenylalanine@neuron map