Not applicable. The name "huLAG-3-CHO-K" refers to a recombinant fusion protein or biologic molecule, typically an engineered human LAG-3 (Lymphocyte-Activation Gene 3) protein linked to a functional domain such as CHO (carbohydrate recognition domain) and possibly a tag or modification (e.g., -K). Such molecules are primarily used in immunological research and drug development. It is not a conventional chemical but a biopharmaceutical reagent. Its main application lies in studying immune checkpoint pathways. LAG-3 is a key inhibitory receptor on T cells, and molecules like huLAG-3-CHO-K are used to investigate T-cell activation, immune regulation, and tolerance. They serve as tools in developing cancer immunotherapies, particularly in blocking interactions between LAG-3 and its ligands (e.g., MHC class II), which can enhance anti-tumor immune responses. These constructs may also be used in binding assays, structural studies, or as standards in immunoassays. Due to their engineered nature, they play a role in screening therapeutic antibodies or small molecules targeting the LAG-3 pathway. Applications are confined to research laboratories and preclinical development in biotechnology and pharmaceutical industries.