Abstract
Renin was localized in the submandibular gland of the adult mouse at light and electron microscopic levels by the unlabeled antibody enzyme method of Sternberger. At the light microscopic level, renin was confined to the granular convoluted tubule (GCT) segment of the gland with considerable variation among GCT cells in intensity of staining. Some GCT cells failed to stain for renin. The pattern of staining was the same in the gland of male and female mice, but in the glands of females GCT segments were smaller and less numerous. At the electron microscopic level, staining for renin was also confined to the GCT cells, and was localized exclusively to the secretory granules. The intensity of staining of the secretory granules within a given GCT cell varied; some cells contained only minimally reactive or negative secretory granules. All other organelles within the GCT cell, except condensing vacuoles, failed to stain.
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