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. 2011 Nov 10;40(Database issue):D187–D190. doi: 10.1093/nar/gkr1043

Figure 1.

Figure 1.

Group II intron structure. (A) An example intron RNA secondary structure, as displayed by the website. Ns in the domain IV loop denote the long ORF sequence that is not shown. (B) Typical ORF structure of a group II intron IEP with domains for RT, X/thumb (maturase, or splicing function), D (DNA-binding) and En (endonuclease) (drawn to scale for the Ll.LtrB intron of Lactococcus lactis). Some lineages of introns lack the En domain, while domain D is a functional domain and not highly conserved in sequence.