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 There is a boom in the development of genetic tests using the scanning technology from the Genome Project, but questions remain regarding the validity and usefulness of these newer tests.
 Genome-wide association studies are a relatively new way for scientists to identify genes involved in human disease.
Gene tests analyze DNA taken from a person's blood, body fluids or tissues.
Acquiring a sample for most tests is simple and low risk-- most require only a sample of blood, hair, or skin.
 Nucleotides: The monomeric units from which DNA or RNA polymers are constructed.
They consist of a purine or pyrimidine base, a pentose sugar, and a phosphate group.