Ostertag EM, Kazazian HH Jr.

Genome Res. 2001 Dec;11(12):2059-65. doi:10.1101/gr.205701

Twin priming: a proposed mechanism for the creation of inversions in L1 retrotransposition.

The RNA is primed by the L1 reverse-transcriptase at both sides of the endonucleotide cleavage, resulting in a partial or complete inversion flanked by a tandem site duplication.