90S pre-ribosomes include the 35S pre-rRNA, the U3 snoRNP, and 40S subunit processing factors but predominantly lack 60S synthesis factor - Grandi, Paola; Baßler, Jochen; Strauß, Daniela; Schäfer, Thorsten; Tschochner, Herbert; Hurt, Ed (Molecular cell, 2002)
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