The promoter - 194 C polymorphism of the nicotinic alpha 7 receptor gene has a protective effect against the P50 sensory gating deficit. - Houy,E.; Raux,G.; Thibaut,F.; Belmont,A.; Demily,C.; Allio,G.; Haouzir,S.; Fouldrin,G.; Petit,M.; Frebourg,T.; Campion,D. (Mol Psychiatry, 2004)