Anti-5HT3D antibodies enable researchers to detect and measure the 5HT3D antigen in biological samples. This target is a reported synonym of the HTR3D gene, which encodes 5-hydroxytryptamine receptor 3D. This protein is known to function in chemical synaptic transmission and signal transduction pathways, among other biological roles. The human version of 5HT3D has a canonical amino acid length of 454 residues and a protein mass of 50.2 kilodaltons, although 4 isoforms have been identified. It is reported to be localized in the cell membrane of cells. 5HT3D is a member of the Ligand-gated ion channel (TC 1.A.9) protein family.