Lead exposure and an ALAD polymorphism in relation to psychiatric symptoms.

Rajan P, Kelsey KT, Schwartz JD, Bellinger DC, Weuve J, Sparrow D, Spiro A 3rd, Smith TJ, Nie H, Hu H, Wright RO.  Lead burden and psychiatric symptoms and the modifying influence of the delta-aminolevulinic acid dehydratase (ALAD) polymorphism: the VA Normative Aging Study. Am J Epidemiol 2007;166:1400-1408.