Used in biomedical research to quantify levels of MUC5B protein in biological samples such as saliva, sputum, and tissue extracts. Helps in studying respiratory diseases including chronic obstructive pulmonary disease (COPD), cystic fibrosis, and asthma, where mucin overproduction affects airway function. Supports investigation into the role of MUC5B in mucosal immunity and epithelial protection. Enables researchers to assess changes in MUC5B expression under inflammatory conditions or in response to therapeutic agents. Widely applied in preclinical studies and biomarker validation for lung and gastrointestinal disorders.