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tRNA-derived RNA fragments (tRFs) are a newly discovered class of micro-RNA-sized small RNAs that are highly abundant in different human and mouse cell lines, mouse tissues and organisms ranging from bacteria to humans. Individual tRFs are generated with precise ends and are not degradation products of the tRNAs.
(Kumar et al., 2015) tRFdb: a database for transfer RNA fragments. Nucleic Acids Res.