Troponin T is a protein found in cardiac and skeletal muscles that plays a critical role in muscle contraction. It is part of the troponin complex, which also includes troponin I and troponin C. Troponin T binds to tropomyosin and helps regulate the interaction between actin and myosin during muscle contraction. In clinical settings, elevated levels of troponin T in the blood can indicate heart damage, making it a valuable biomarker for diagnosing myocardial infarction and other cardiac conditions.