Used for quantitative measurement of Activin A in biological samples such as serum, plasma, and cell culture supernatants. Widely applied in research settings to study reproductive biology, inflammation, autoimmune diseases, and cancer progression. Helps assess AC levels in clinical samples during diagnostic and therapeutic monitoring. Commonly used in endocrinology and immunology research to understand signaling pathways involving activins. Suitable for high-throughput screening in drug development and biomarker validation studies.