The small subunit of the 80s ribosome of eukaryotes. It is composed of the 18S RIBOSOMAL RNA and 32 different RIBOSOMAL PROTEINS.

Synonyms: 40S Ribosome Subunits Ribosomal Subunit, 40S Subunit, 40S Ribosomal Ribosomal Subunits, Small, Eukaryotic Subunits, 40S Ribosomal Eukaryotic Small Ribosomal Subunits Ribosome Subunits, Small, Eukaryotic Subunits, 40S Ribosome Small Ribosome Subunits, Eukaryotic Ribosome Subunit, 40S Small Ribosomal Subunits, Eukaryotic Ribosomal Subunits, 40S 40S Ribosome Subunit Subunit, 40S Ribosome 40S Ribosomal Subunits Eukaryotic Small Ribosome Subunits 40S Ribosomal Subunit Ribosome Subunits, 40S