Described as secreting a mouse monoclonal antibody (IgM) reacting with all adult rat type 2 fibers in immunofluorescence and with all adult rat type 2 MHCs (myosin heavy chain) in Western blotting; recognizing also rat neonatal fibers in immunofluorescence and rat neonatal MHCs in Western blotting; established in 1985 by fusion of NSO myeloma cells with spleen cells from a BALB/c mouse immunized with purified myosin from bovine subcutaneous muscle