DN, dN, or dn may refer to:
Deoxyribonucleic acid ( ( listen); DNA) is a molecule composed of two chains (made of nucleotides) which coil around each other to form a double helix carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
DNA profiling (also called DNA fingerprinting, DNA testing, or DNA typing) is the process of determining an individual's DNA characteristics, which are as unique as fingerprints.
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. It includes any method or technology that is used to determine the order of the four bases—adenine, guanine, cytosine, and thymine—in a strand of DNA.
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome.
Dnipro (Ukrainian: Дніпро), until May 2016 Dnipropetrovsk (Ukrainian: Дніпропетро́вськ [ˌdʲnʲiprɔpɛˈtrɔu̯sʲk]) also known as Dnepropetrovsk (Russian: Днепропетро́вск [dʲnʲɪprəpʲɪˈtrofsk]), is Ukraine's fourth largest city, with about one million inhabitants.
DNA polymerases are enzymes that synthesize DNA molecules from deoxyribonucleotides, the building blocks of DNA.
DNA methylation is a process by which methyl groups are added to the DNA molecule. Methylation can change the activity of a DNA segment without changing the sequence.