UnaL2 LINE 3′ element
The UnaL2 LINE 3′ element is an RNA element found in the UnaL2 LINE and partner SINE from eel. This conserved element is a stem-loop that is critical for their retrotransposition found in their 3′ end. The first step of retrotransposition is the recognition of their 3′ tails by UnaL2-encoded reverse transcriptase. The NMR structure of a 17-nucleotide RNA derived from the 3′ tail of UnaL2 has been determined.