These X3 ELISA kits are immunodetection tools for measuring the levels of X3 in biological samples. X3 is an alias of the human XPR1 gene, which encodes the protein, xenotropic and polytropic retrovirus receptor 1. Notably, X3 is known to play a role in the transport of ions, among other functions. The XPR1 protein is 696 amino acid residues in length and 81.5 kilodaltons in mass. However, as many as 2 protein isoforms have been identified. It is localized to the cell membrane of the cell. In terms of tissue specificity, it is widely expressed across many tissue types. Other names for this target antigen include IBGC6, SLC53A1, and SYG1. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.