Anti-R-spondin family, member 4 antibodies enable researchers to detect and measure the R-spondin family, member 4 antigen in biological samples. This target is a reported synonym of the RSPO4 gene, which encodes R-spondin 4. This protein is known to function in the Wnt signaling pathway, among other biological roles. The human version of R-spondin family, member 4 has a canonical amino acid length of 234 residues and a protein mass of 26.2 kilodaltons, although 2 isoforms have been identified. It is reported to be a secreted protein. This target antigen may also be known as R-spondin family, member 4.