Anti-Rabex-5 antibodies are protein reagents that detect specific antigens. The Rabex-5 antigen is another term for the human protein RAB guanine nucleotide exchange factor 1, encoded by the RABGEF1 gene. The protein is known to function in protein phosphorylation, among other biological roles. Canonically, it has an amino acid length of 491 residues and a mass of 56.9 kilodaltons. Its subcellular localization is in the cytoplasm.