Subunit of the 40S ribosomal complex (PubMed:23636399). In wing imaginal disks, might have a role in translation rate, growth and cell competition, probably through regulation of Xrp1 expression (PubMed:31841522). Might have a role in development and longevity (PubMed:31841522). Subunit of the 40S ribosomal complex (PubMed:23636399). Belongs to the eukaryotic ribosomal protein eS12 family.