NIAGADS (NIA Genetics of Alzheimer's Disease Data Storage Site) is a national genetics data repository that facilitates access of genotypic data to qualified investigators for the study of the genetics of late-onset Alzheimer's disease. It is the policy of the NIA that all genetic data derived from NIA-funded studies for the genetics of late-onset Alzheimer's disease be deposited at NIAGADS, another NIA-approved site, or both. NIAGADS, along with other NIA-approved sites, will make these Genetic Data and Associated Phenotypic Data available to qualified investigators in the scientific community for secondary analysis.