Used in biomedical research to quantify rat transferrin receptor (TFR/CD71) levels in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit enables researchers to study iron metabolism, cellular proliferation, and blood-brain barrier transport in rodent models. It is commonly applied in neuroscience, immunology, and cancer research where TFR expression is linked to tumor growth, neurodegenerative diseases, and inflammatory conditions. The assay provides a sensitive and specific method for monitoring changes in TFR levels under experimental treatments, making it valuable for preclinical studies and drug development.