MER21B (DF0000741)

MER21B (Long Terminal Repeat) for ERVL endogenous retrovirus


MER21B is a member of a closely related group of LTRs including: MER34, MER39, LTR29, LTR48 and LTR49. Target site duplication is unclear -- either 4 or 5 bp. Note that MER stands for MEdium Reiteration frequency interspersed repeat. As such, MERs as a group are a grab bag of DNA transposons and retrotransposons.


  1. Medium reiteration frequency repetitive sequences in the human genome.
    Kaplan DJ, Jurka J, Solus JF, Duncan CH;
    Nucleic Acids Res 1991;19:4731-4738 Pubmed


Accession Name Wikipedia
Type Retrotransposon Article
Class LTR Article
Superfamily ERVL Article

Hit Statistics

The model is 868 positions long. The average length of non-redundant hits to the model is 458.8. This table shows the number of hits above score thresholds:

Species Gathering Trusted
non-redundant all hits non-redundant all hits
Mus musculus 1205 3817 956 2749
Homo sapiens 2148 12534 2027 10523

External Database Links

  • Repbase : MER21B [Requires Repbase registration]