Recent data suggest that BC3H1 cells may more closely resemble cells in an arrested state of skeletal muscle differentiation than smooth muscle cells; Tested and found negative for ectromelia virus (mousepox). Tumorigenecity: Isoenzyme: Histopathology: tumor; Smooth muscle like. Subculture: Split ratio: Media change: Reverse transcritase: Productionadenylate phosphokinase, Creatine phosphokinase.