label: Short Interspersed Element
label_lc: short interspersed element
description: "SINEs.  Short, 100-300 bases long, highly repeated sequences which contain RNA polymerase III promoters. The primate Alu and the rodent B1 SINEs are derived from 7SL RNA, the RNA component of the signal recognition particle. Most other SINEs are derived from tRNAs including the MIRs (mammalian-wide interspersed repeats)."