DN, dN, or dn may refer to:
Deoxyribonucleic acid ( (listen); DNA) is a molecule composed of two chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.
DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA.
DNA profiling (also called DNA fingerprinting) is the process of determining an individual's DNA characteristics, which are as unique as fingerprints.
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.
Dnipro (Ukrainian: Дніпро, Russian: Днепр, Dnepr), called Dnipropetrovsk until May 2016 (Ukrainian: Дніпропетро́вськ [ˌdʲnʲiprɔpɛˈtrɔu̯sʲk]; Russian: Днепропетро́вск [dʲnʲɪprəpʲɪˈtrofsk] Dnepropetrovsk), is Ukraine's fourth-largest city, with about one million inhabitants.
DNA polymerase is an enzyme that synthesizes DNA molecules from deoxyribonucleotides, the building blocks of DNA.
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome.
The Dnieper (UK: , US: )other names is one of the major rivers of Europe, rising in the Valdai Hills near Smolensk, Russia, before flowing through Belarus and Ukraine to the Black Sea.
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.