Junk DNA

Junk DNA or noncoding DNA are the components of DNA sequences that do not encode for protein sequences. Earlier, they were suposed to be non-functional, but now research indicates that these bits of seemingly random code act as important regulators within the human genome, serving as on and off switches, activating important genes and regulating how they are expressed. Please note that the term Junk DNA is also outdated now. Now there are evidences that indicate that many “junk DNA” sequences useful to some extent.