Anti-extended synaptotagmin protein 3 antibodies enable researchers to detect and measure the extended synaptotagmin protein 3 antigen in biological samples. This target is a reported synonym of the ESYT3 gene, which encodes extended synaptotagmin 3. This protein is known to function in the metabolism of lipids, among other biological roles. The human version of extended synaptotagmin protein 3 has a canonical amino acid length of 886 residues and a protein mass of 100 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the ER and cell membrane of cells. extended synaptotagmin protein 3 is a member of the Extended synaptotagmin protein family.