Ready to use. Mouse Monoclonal. Intended for in vitro diagnostic (IVD) use. Actin smooth muscle reacts with smooth muscle cells, myofibroblasts, and myoepithelial cells. It can be used as an aid in classifying smooth muscle and myoepithelial tumors. References 1. Cooke PH. A filamentous cytoskeleton in vertebrate smooth muscle fibers. J Cell Biol. 1976; 68:539-56 2. Skalli O, et al. A monoclonal antibody against alpha-smooth muscle actin: a new probe for smooth muscle differentiation. J Cell Biol. 1986; 103:2787-96. 3. Perez-Montiel MD, et al. Differential expression of smooth muscle myosin, smooth muscle actin, h-caldesmon, and calponin in the diagnosis of myofibroblastic and smooth muscle lesions of skin and soft tissue. Am J Dermatopathol. 2006; 28:105-11.