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[Smooth muscle cells express in culture a surface antigen identified by a polyclonal anti-actin antibody].

These results demonstrate the presence of actin on the surface of smooth muscle cells in culture. The expression of surface actin is modified by drugs (calcium, ionophore A 23187, LTB4) involved in cell metabolism. Actin exists also in intracellular cytoskeleton and extracellular matrix and is a smooth muscle differentiation marker that may be related to adhesion and cell locomotion.