Anti-trafficking protein particle complex subunit 4 antibodies are used for the immunodetection of the protein encoded by the TRAPPC4 gene. In humans, the canonical protein has a reported length of 219 amino acid residues and a mass of 24.3 kDa. Its subcellular localization is in the ER, Golgi, and cell membrane. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the TRAPP small subunits protein family, it is an important component of the TRAPP complexes which has a function of guanine nucleotide exchange factor activity for Rab1 GTPase (Probable). The gene encoding this protein is implicated in Neurodevelopmental disorder with epilepsy, spasticity, and brain atrophy. Other names for this target antigen include HSPC172, NEDESBA, PTD009, SBDN, SYNBINDIN, TRS23, TRS23 homolog, and CGI-104. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.