Used in biomedical research to quantify Claudin-3 protein levels in cell or tissue samples. Helps study tight junction integrity and epithelial barrier function. Commonly applied in research on inflammatory diseases, cancer progression, and organ-specific disorders such as those affecting the gut, lung, or blood-brain barrier. Enables researchers to assess changes in Claudin-3 expression under experimental conditions, supporting studies on drug delivery, infection responses, and cellular permeability.