RNA, Spliced Leader

**Definition:** The small RNAs which provide spliced leader sequences, SL1, SL2, SL3, SL4 and SL5 (short sequences which are joined to the 5' ends of pre-mRNAs by TRANS-SPLICING). They are found primarily in primitive eukaryotes (protozoans and nematodes).

**Tree numbers:** - D13.444.735.790.552.968

**Synonyms:** - SL RNA - Spliced Leader RNA