GDNF and schizophrenia: Lee et al. [22] deployed a single-strand conformational polymorphism (SSCP) analysis but did not find any single nucleotide variations associated with schizophrenia; however, they reported that an (AGG)10 short tandem repeat (microsatellite) polymorphism in the 3′ untranslated region of the GDNF gene was more common in patients with schizophrenia than in healthy controls.