Anti-SCZD9 antibodies enable researchers to detect and measure the SCZD9 antigen in biological samples. This target is a reported synonym of the RGS4 gene, which encodes regulator of G protein signaling 4. This protein is known to function in brain development and GPCR signaling pathways, among other biological roles. The human version of SCZD9 has a canonical amino acid length of 205 residues and a protein mass of 23.3 kilodaltons, although 5 isoforms have been identified.