Anti-SAR1 antibodies enable researchers to detect and measure the SAR1 antigen in biological samples. This target is a reported synonym of the IQGAP1 gene, which encodes IQ motif containing GTPase activating protein 1. This protein is known to function in cell migration and MAPK cascade signaling pathways, among other biological roles. The human version of SAR1 has a canonical amino acid length of 1657 residues and a protein mass of 189.3 kilodaltons. It is reported to be localized in the cell membrane, nucleus, and cytoplasm of cells and widely expressed in many tissue types.