Not applicable. huEGFR-CHO-K is not a chemical but rather refers to a recombinant protein expression system, typically describing a human epidermal growth factor receptor (huEGFR) expressed in Chinese Hamster Ovary (CHO-K1) cells. It is used in research settings to study receptor function, signal transduction pathways, and for screening therapeutic agents such as monoclonal antibodies or tyrosine kinase inhibitors targeting EGFR in cancer. This system supports the development and optimization of biopharmaceuticals due to the high protein yield and proper post-translational modifications provided by CHO-K cells.