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.
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome.
DNA polymerase is an enzyme that synthesizes DNA molecules from deoxyribonucleotides, the building blocks of DNA.
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.
Dnipro (Ukrainian: Дніпро [d⁽ʲ⁾n⁽ʲ⁾iˈprɔ] (listen); Russian: Днепр, romanized: Dnepr), called Dnipropetrovsk (Ukrainian: Дніпропетро́вськ [ˌd⁽ʲ⁾n⁽ʲ⁾ipropeˈtrɔu̯sʲk]; Russian: Днепропетро́вск, romanized: Dnepropetróvsk [dʲnʲɪprəpʲɪˈtrofsk]) until May 2016, is Ukraine's fourth-largest city, with about one million inhabitants.
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.
A DNA virus is a virus that has DNA as its genetic material and replicates using a DNA-dependent DNA polymerase.