Cardiac Troponin I (cTnI) is a heart-specific regulatory protein within the troponin complex that controls cardiac muscle contraction. Unlike skeletal isoforms, cTnI is expressed exclusively in cardiomyocytes, making it a highly specific biomarker for myocardial injury. Clinically, cTnI is the gold standard for diagnosing acute coronary syndrome (ACS) and myocardial infarction (MI), with high-sensitivity immunoassays enabling earlier and more accurate detection of cardiac injury. Beyond diagnostics, cTnI antibodies are valuable research tools for studying troponin release, cardiomyocyte biology, and autoantibody-related cardiac dysfunction. Catalina provides rigorously validated cTnI antibodies for translational studies in cardiovascular research, biomarker development, diagnostic assay design, and myocardial pathology.