Abstract
The electron microscopic investigation of the m. sphincter pupillae of adult black hooded rats showed the presence of melanosomes in the smooth muscle cells. In shape and size the melanosomes were like those of the iridial epithelium. In addition, premelanosomes and tyrosinase activity were observed as well as melanosomes with disintegrated content and acid phosphatase activity. The data suggest that the smooth muscle cells of the m. sphincter pupillae are capable of the formation and degradation of melanosomes.
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