... Profiles of Cathepsins K, L, and S in Human Breast, Lung, and Cervical Cancer Binbin Chen and Manu O Platt* Abstract Background: Cathepsins K, L, and S are cysteine proteases upregulated in cancer and ... consistent absence of cathepsin K in normal breast tissue across all patients Conclusions: To summarize, this sensitive assay provides quantitative outputs of cathepsins K, L, and S activities ... viewing clarity All human recombinant cathepsins were from Enzo Life Sciences (Plymouth Meeting, PA) Human cathepsins K and S were expressed in insect cells, human cathepsin V was expressed in NSO...