Used in biomedical research to quantitatively measure levels of Cyclin-dependent kinase 4 (CDK-4) in human cell or tissue samples. This ELISA kit helps study cell cycle regulation, particularly in cancer research where CDK-4 plays a key role in controlling the G1 to S phase transition. It is widely applied in oncology studies, drug development for CDK inhibitors, and biomarker validation. The assay enables high-throughput screening and evaluation of therapeutic responses in diseases like breast cancer, melanoma, and other proliferative disorders.