A large ribonucleoprotein complex that is an early preribosomal complex. In S. cerevisiae, it has a size of 80S 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.
Source:
GOC:krc,
PMID:12068309,
GOC:vw,
PMID:15590835,
PMID:12957375,
PMID:15120992