MYH11 (Myosin Heavy Chain 11): MYH11 is a gene that codes for a smooth muscle myosin heavy chain, a crucial component of the contractile apparatus in smooth muscle cells. This protein is vital for the contraction and relaxation of smooth muscles, supporting important functions such as vascular regulation, gastrointestinal motility, and respiratory processes. MYH11 plays a key role in maintaining the structure and function of smooth muscle tissues across the body. Alterations or mutations in this gene may lead to vascular diseases, including thoracic aortic aneurysms and dissections.