The cystatin B (stefin B) ELISA kits listed below are analytical tools for measuring concentrations of cystatin B (stefin B) in various samples. cystatin B (stefin B) is an alternative name for the human CSTB gene, which encodes the protein, cystatin B. The target protein is an intracellular thiol proteinase inhibitor. Structurally, the CSTB protein is described to be 98 amino acid residues in length and 11.1 kilodaltons in mass. It is localized to the nucleus and cytoplasm of the cell. Other names for this target antigen include CPI-B, CST6, and EPM1. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.