The Quantikine Human Pro-Cathepsin B Immunoassay is a 4.5 hour solid phase ELISA designed to measure the pro-form of cathepsin B in cell culture supernates, cell lysates, serum, plasma, saliva, and urine. It contains NS0-expressed recombinant human Pro-Cathepsin B and antibodies raised against the recombinant factor. Natural human Pro-Cathepsin B showed dose-response curves that were parallel to the standard curves obtained using the recombinant Quantikine kit standards, indicating that this kit can be used to determine relative levels of natural human Pro-Cathepsin B. Range: 0.16 - 10 ng/mL. Sensitivity: 0.079 ng/mL. Time: 4.5 hours