Anti-Rap1 antibodies enable researchers to detect and measure the Rap1 antigen in biological samples. This target is a reported synonym of the RABGEF1 gene, which encodes RAB guanine nucleotide exchange factor 1. This protein is known to function in protein phosphorylation, among other biological roles. The human version of Rap1 has a canonical amino acid length of 491 residues and a protein mass of 56.9 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasm of cells.