Abstract
1. 1. Relaxed cells isolated from ascidian body-wall muscle were morphologically very similar to relaxed common smooth muscle cells. 2. 2. The contracted cells, however, possessed striations which were resolved into a repeating pattern of light and dark bands using phase contrast microscope. 3. 3. The relaxed ascidian cells treated with Triton X-100 were contracted and showed the striations by adding Ca 2+. 4. 4. By an indirect immunofluorescence method, it was clearly seen that antiactin spread uniformly in the relaxed cells, while this antibody was concentrated on the dark bands of striations in the contracted cells.
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