Anti-S5 antibodies enable researchers to detect and measure the S5 antigen in biological samples. This target is a reported synonym of the RPS5 gene, which encodes ribosomal protein S5. This protein is known to function in protein translation, among other biological roles. The human version of S5 has a canonical amino acid length of 204 residues and a protein mass of 22.9 kilodaltons. It is reported to be localized in the nucleus and cytoplasm of cells and widely expressed in many tissue types. S5 is a member of the Universal ribosomal protein uS7 protein family.