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Deoxyribonucleic acid (often abbreviated as DNA) is a molecule which is found in all living organisms. The DNA is present in the nucleus of eukaryotic cells, in the cytoplasm of prokaryotic cells, and in the matrix of both mitochondria and chloroplasts. Some viruses also have DNA encapsulated in their capsids. DNA is considered to be the molecule of heredity because it constitutes the genome of living organisms and is transmitted in totality or in part during the process of reproduction. It is the basis for the synthesis of proteins.