Regulation of these structures is the primary function of RNA complexes formed from piwi-interacting RNA. A group of these structures that uses a mechanism (15[1])similar to rolling circle replication are called helitrons. (15[1]-5[1])An unusually high (-5[1])amount of these structures are found in Trichomonas vaginalis, which also has the Mariner type of these structures. LINEs and SINEs are two classes of these structures, (15[1])the latter of which includes the widespread (*) Alu element. (-5[1])Knockout rats are often produced with the Sleeping Beauty system of these structures. The Ac/Ds system in corn uses class 2 examples of these structures, which use (10[1])a “cut-and-paste” mechanism. For 10 points, name these genetic sequences (-5[1])discovered by Barbara (10[1])McClintock, (10[2])which can move around a genome. ■END■ (10[1]0[1])