Used in biomedical research to quantify activin A levels in biological samples such as serum, plasma, or cell culture supernatants. Helps in studying the role of activin A in cellular processes like proliferation, differentiation, and apoptosis. Commonly applied in immunology, reproductive biology, and cancer research to understand signaling pathways and disease mechanisms. The ELISA format allows for high sensitivity and specificity, enabling researchers to detect low concentrations of activin A with reliable results.