Conserved non-coding sequence

A conserved non-coding sequence (CNS) is a DNA sequence of noncoding DNA that is evolutionarily conserved. Sequence conservation is a useful marker of function, so conserved non-coding sequences are functional elements of the genome other than coding DNA. Some of these functional elements include non-coding genes, regulatory sequences, scaffold attachment regions; origins of DNA replication; centromeres; and telomeres (see Non-coding DNA).

Source: Wikipedia — Conserved non-coding sequence (CC BY-SA 4.0)