Described as secreting a mouse monoclonal antibody (IgG2a) detecting all fibers in skeletal muscle and myosin heavy chains on Western blots and detecting mammalian, chicken, zebrafish, axolotl, xenopus skeletal muscle myosin heavy chains; the cell line was established in 1985 by fusion of X63AG8.653 cells with spleen cells from a BALB/c mouse that had been immunized with human skeletal muscle myosin