MYL4 (Myosin Light Chain 4) is a Protein Coding gene. Diseases associated with MYL4 include Atrial Fibrillation, Familial, 18 and Familial Atrial Fibrillation. Among its related pathways are Sertoli-Sertoli Cell Junction Dynamics and Actin Nucleation by ARP-WASP Complex. Myosin is a hexameric ATPase cellular motor protein. It is composed of two myosin heavy chains, two nonphosphorylatable myosin alkali light chains, and two phosphorylatable myosin regulatory light chains.