Abstract
Employing antisera produced in rabbits against actin, smooth and skeletal muscle myosin, α-actinin, tropomyosin, and tubulin, we have been able to demonstrate the presence of these antigens in tissue sections. The antisera were prepared against well-characterized, relatively pure antigens and had been previously studied in isolated cells. This permitted reliable confirmation and extension of studies demonstrating contractile proteins in non-muscle cells. Of particular interest was the visualization of a unique banding pattern in small vessels with sera directed against actin, smooth muscle myosin, tropomyosin, and actinin. An unexplained observation was the presence of significant amounts of tubulin in endomysial cells. The relationship of our observations to those recently appearing in the literature is discussed.
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