Used to measure thymidine kinase enzyme (TK1) activity in rabbit samples, particularly in research settings focused on cell proliferation and cancer studies. Helps in monitoring tumor growth and response to therapy in preclinical animal models. Commonly applied in veterinary oncology research and pharmaceutical development for assessing cell turnover rates. Provides a quantitative, sensitive method to evaluate TK1 levels in serum or tissue extracts, supporting studies on immune response and disease progression.