Anti-STK39 antibodies are used in the immunodetection of the protein serine/threonine kinase 39. In humans, the canonical protein has a reported length of 545 amino acid residues and a mass of 59.5 kDa. Its subcellular localization is in the nucleus and cytoplasm. Up to 2 different isoforms have been reported for this protein. It is reported to be highly expressed in the brain and pancreas followed by heart, lung, kidney, skeletal muscle, liver, placenta and testis. A member of the STE Ser/Thr protein kinase protein family, STK39 is believed to act as a mediator of stress-activated signals. Post-translational modifications have been described, including phosphorylation. Synonyms for this target antigen include PASK, SPAK, STE20/SPS1-related proline-alanine-rich protein kinase, STE20/SPS1 homolog, and DCHT. STK39 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of STK39 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.