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Model for the role of Rlp7p in processing of 27SA precursor RNAs. Rlp7p interacts with the pre-rRNA through its RNA-binding domain and tethers exonucleases (Exo) that carry out the 5′ to 3′ exonucleolytic reactions at the 5′ end of 27SA precursors. Rlp7p could also interact with ITS2 and attract the endonuclease (Endo) that cleaves it, as symbolized by the arrow and question mark.
