Cellular myosin that appears to play a role in cytokinesis, cell shape, and specialized functions such as secretion and capping. Myosin is a hexameric protein that consists of 2 heavy chain subunits (MHC), 2 alkali light chain subunits (MLC) and 2 regulatory light chain subunits (MLC-2). Colocalizes with actin filaments at lamellipodia margins and at the leading edge of migrating cells. Expressed in fibroblasts, brain, lung, kidney, spleen, and skeletal, cardiac and smooth muscles. The rodlike tail sequence is highly repetitive, showing cycles of a 28-residue repeat pattern composed of 4 heptapeptides, characteristic for alpha-helical coiled coils. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family.