Titin structure refers to the study of the giant protein titin, which is the largest known protein in the human body. Titin is found in skeletal and cardiac muscles and plays a crucial role in muscle function. Its structure consists of multiple domains, including immunoglobulin-like domains, fibronectin type III domains, and kinase domains. Research in this area focuses on understanding the molecular structure of titin, its role in muscle contraction and relaxation, and how mutations in the gene encoding titin can lead to various muscle diseases. This field of research is important for advancing our understanding of muscle function and the development of therapies for muscle-related disorders.