Some articles on gcpiii:

Glutamate Carboxypeptidase II - Potential Therapeutic Applications - Other Potential Therapeutic Applications - Drug Addiction
... As GCPIII inhibition was shown to possibly limit schizophrenic behavior in this model, this suggests that GCPIII inhibition, thus, reduces the effect of PCP ... been shown with increasing evidence to be related to glutamate levels, on which NAAG and GCPIII can have some regulatory effect ...