Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the construction of other cell components such as proteins and RNA used in the development and functioning of all known living organisms and many viruses. The main role of DNA is the long-term storage of genetic information. The DNA segments that code for proteins or RNA are called genes, whereas other DNA sequences have structural purposes, or are involved in regulating the use of this genetic information. - wikipedia
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