The dopamine b-hydroxylase -1021C/T polymorphism is associated with the risk of Alzheimer 's disease in the Epistasis Project .
O B-GeneOrGeneProduct I-GeneOrGeneProduct B-SequenceVariant O O O O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O O