DNA: Shorthand for deoxyribonucleic acid, DNA is the molecule that carries the genetic instructions in (most) living organisms.
DNA microarray: Commonly known as a gene chip, a microarray can simultaneously test for millions of mutations in a patient or look at all 25,000 genes in the genome to measure which are turned on or off.
DNA sequence: The order of bases—As, Ts, Cs, and Gs—in a given region or a single strand of DNA.
DNA sequencing: The process of determining the order of nucleotide bases in a region of DNA. See also, Research Methods under "What We Do."