Anti-GRSP1 antibodies enable researchers to detect and measure the GRSP1 antigen in biological samples. This target is a reported synonym of the FRMD4B gene, which encodes FERM domain containing 4B. The human version of GRSP1 has a canonical amino acid length of 1034 residues and a protein mass of 118 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cytoplasm of cells.