These JIP4 ELISA kits are immunodetection tools for measuring the levels of JIP4 in biological samples. JIP4 is an alias of the human SPAG9 gene, which encodes the protein, sperm associated antigen 9. Notably, JIP4 is known to play a role in neuronal differentiation and the regulation of cell migration, among other functions. The SPAG9 protein is 1321 amino acid residues in length and 146.2 kilodaltons in mass. However, as many as 6 protein isoforms have been identified. It is localized to the cytoplasmic vesicles, lysosomes and cytoplasm of the cell. In terms of tissue specificity, it is found to be preferentially expressed in testis on the round spermatids of stage I, II and II. This protein is known to be phosphorylated. Other names for this target antigen include CT89, HLC-6, and HLC4. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.