The small ribonucleoprotein component of RIBOSOMES. It contains the MESSENGER RNA binding site and two TRANSFER RNA binding sites - one for the incoming AMINO ACYL TRNA (A site) and the other (P site) for the peptidyl tRNA carrying the elongating peptide chain.
Subtype terms (3)
More specific conditions that are subtypes of Ribosome Subunits, Small in the MeSH hierarchy.