Lead exposure and an ALAD polymorphism in relation to multiple cognitive functions.

Rajan P, Kelsey KT, Schwartz J, Bellinger DC, Weuve J, Spiro A 3rd, Sparrow D, Smith TJ, Nie H, Weisskopf MG, Hu H, Wright RO. Interaction of the δ-aminolevulinic acid dehydratase (ALAD) polymorphism and lead burden on cognitive function: the Normative Aging Study. Journal of Occupational and Environmental Medicine 2008;50:1053-1061.