Anti-VIPAR antibodies enable researchers to detect and measure the VIPAR antigen in biological samples. This target is a reported synonym of the VIPAS39 gene, which encodes VPS33B interacting protein, apical-basolateral polarity regulator, spe-39 homolog. This protein is known to function in cell differentiation and intracellular protein transport, among other biological roles. The human version of VIPAR has a canonical amino acid length of 493 residues and a protein mass of 57 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cytoplasmic vesicles and cytoplasm of cells and notably expressed in many tissues, such as the caudate, vagina, and bronchus. VIPAR is a member of the SPE39 protein family.