Troponin I (TnI) is a protein found in muscle tissue that plays a crucial role in the regulation of muscular contraction. It is one of the three subunits of the troponin complex, along with troponin T (TnT) and troponin C (TnC). The primary function of TnI is to inhibit the interaction between actin and myosin, thereby preventing muscle contraction in the absence of calcium ions.
