HUMAN ALU REPEAT. “Over 5% of the mammalian genome consists of short interspersed elements (SINEs), typified by the human Alu repeat. These are RNA polymerase III transcribed sequences whose expression is usually silenced. However, upon prolonged exposure to DNA damaging agents that predominantly cause double strand breaks, transcription from the human Alu elements and murine SINEs is strongly induced.”
http://journal.frontiersin.org/article/10.3389/fgene.2013.00136/full