Anti-HHL antibodies enable researchers to detect and measure the HHL antigen in biological samples. This target is a reported synonym of the RABGAP1L gene, which encodes RAB GTPase activating protein 1 like. This protein is known to function in endocytosis and protein transport, among other biological roles. The human version of HHL has a canonical amino acid length of 815 residues and a protein mass of 92.5 kilodaltons. It is reported to be localized in the cytoplasmic vesicles and Golgi of cells.