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The rapidly evolving internal transcribed spacer 2 (ITS2) in the pre-ribosomal RNA is one of the most commonly applied phylogenetic markers at species and genus level. Yet, during ribosome biogenesis ITS2 is removed in all eukaryotes by a common, but still unknown, mechanism. Here we describe the existence of an RNA processome, assembled from four conserved subunits, Las1-Grc3-Rat1-Rai1, that carries...