A large ribonucleoprotein complex considered to be the earliest preribosomal complex. In S. cerevisiae, it has a size of 90S and consists of the 35S pre-rRNA, early-associating ribosomal proteins most of which are part of the small ribosomal subunit, the U3 snoRNA and associated proteins. (Gene Ontology, GO_0030686)
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10 proteins localized to the 90s preribosome cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.