Abstract
The seemingly paradoxical finding that granular convoluted tubules (GCT) cells of rat submandibular gland possess large stores of secretory protein, yet appear deficient in organelle systems necessary for protein synthesis was investigated by autoradiography. The results show that the protein turnover time of the GCT cells was very slow, in contrast to that seen in the acinar cells. Thus, the limited ability for protein synthesis exhibited by the GCT cells is consistent with a very low demand for their secretory products.
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