Used in research settings to measure calcineurin (CaN) enzyme activity in rat tissue samples, particularly in studies related to cellular signaling, immune response, and neurological function. The ELISA format allows for high-sensitivity detection and quantification of CaN protein levels, supporting investigations into diseases involving calcium-dependent pathways, such as cardiac hypertrophy, neurodegenerative disorders, and autoimmune conditions. Commonly applied in preclinical studies using rat models to evaluate therapeutic interventions and molecular mechanisms.