since in these experiments the specific radioactivity of the extracellular leucine is the same whether fragments of stimulated or unstimulated glands incorporate the radioactive amino acid , the increase of incorporation in the parotid and the decrease in the submandibular cells can not be ascribed to differences in specific radioactivity of leucine , unless the intracellular leucine pool should show great differences between secreting and non-secreting cells .
C0007634
the
C1327616
secreting