Used in biomedical research to quantify Cathepsin L protein levels in biological samples such as cell lysates, serum, plasma, and tissue homogenates. Widely applied in studies related to cancer progression, where Cathepsin L is associated with tumor invasion and metastasis. Supports research in inflammatory diseases, osteoarthritis, and bone remodeling due to its role in extracellular matrix degradation. Also utilized in immunology and infectious disease studies, including investigations into viral entry mechanisms, as Cathepsin L plays a role in the processing of certain viral proteins. Provides a reliable, sensitive, and specific method for high-throughput screening in drug development and therapeutic monitoring.