Jeck WR, Sorrentino JA, Wang K, Slevin MK, Burd CE, Liu J, Marzluff WF, Sharpless NE.

RNA. 2013 Feb;19(2):141-57. doi: 10.1261/rna.035667

Circular RNAs are abundant, conserved, and associated with ALU repeats.

ecircRNA have long half-life. Untemplated Ts are observed where the reverse-transcriptase crosses the branchpoints of lariats. Circularised exons tend to be flanked by ALU repeats in opposite orientation.