The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types [1]. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament [1]. The coiled-coil region provides the structural backbone the thick filament [1].

1: Complete nucleotide and encoded amino acid sequence of a mammalian myosin heavy chain gene. Evidence against intron-dependent evolution of the rod. Strehler EE, Strehler-page M-A, Perriard JC, Periasamy M, Nadal-ginard B; J MOL BIOL 1986;190:291-317. PMID:3783701