Anti-Vma4 antibodies enable researchers to detect and measure the Vma4 antigen in biological samples. This target is a reported synonym of the ATP6V1E1 gene, which encodes ATPase H+ transporting V1 subunit E1. This protein is known to function in autophagy pathways, among other biological roles. The human version of Vma4 has a canonical amino acid length of 226 residues and a protein mass of 26.1 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasmic vesicles and cell membrane of cells and widely expressed in many tissue types. Vma4 is a member of the V-ATPase E subunit protein family.