Anti-REGL antibodies enable researchers to detect and measure the REGL antigen in biological samples. This target is a reported synonym of the REG1B gene, which encodes regenerating family member 1 beta. This protein is known to function in the regulation of cell proliferation, among other biological roles. The human version of REGL has a canonical amino acid length of 166 residues and a protein mass of 18.7 kilodaltons. It is reported to be a secreted protein that is notably expressed in the small intestine, pancreas, and duodenum.