Probable transcription factor, which may be responsible for the formation of myoepithelial cells in early muscle development in larva and the formation of non-muscle tissues in later bud stages and mesoderm-like structures in the medusa. Efficient DNA binding requires dimerization with another bHLH protein. Homodimer (By similarity). Expression is seen at the point of medusa formation in the ectodermal and endodermal bud tissues, and in the entocodon which gives rise to all smooth and striated muscle cells. After the subumbrellar plate differentiates from the endoderm, strong expression is detected until the medusa detaches from the gonzoid. Expression is observed in the distal part of the medusa but diminishes in entocodon-derived muscles as the tissues differentiate, with expression disappearing completely after stage 8. In later stages expression is seen in the distal and proximal parts of the bud and depending on state of maturity, in the developing gonadal tissue. Detected in the embryo and early planula larva stage. It disappears when larvae transform to the polyp stage after 2-3 days. Strong expression is seen in the gonozoid and in all stages of medusa bud development.