Anti-NSUN4 antibodies are used in the immunodetection of the protein NOP2/Sun RNA methyltransferase 4. In humans, the canonical protein has a reported length of 384 amino acid residues and a mass of 43.1 kDa. Its subcellular localization is in the mitochondria. Up to 4 different isoforms have been reported for this protein. It is notably expressed in the testis. A member of the RsmB/NOP protein family, NSUN4 is known to be involved in mitochondrial ribosome assembly. Synonyms for this target antigen include 5-methylcytosine tRNA methyltransferase NSUN4, NOL1/NOP2/Sun domain family member 4, NOP2/Sun RNA methyltransferase family member 4, and 5-methylcytosine rRNA methyltransferase NSUN4. NSUN4 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some NSUN4 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, Immunohistochemistry is also a common application.