Free amino acids were measured with a microtechnique employing labelling with 14C‐dansyl‐Cl and separation with two‐dimensional thin‐layer chromatography. Most amino acids occurred in greater amounts in the islets than in the exocrine pancreas. Aspartic acid, valine and leucine were present in tenfold amounts. It is postulated that the β‐cells are equipped with binding sites for large amounts of the latter amino acid. Like nervous tissue, the pancreatic islets were characterized by the presence of gamma‐aminobutyric acid and high levels of taurine.
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Briel et al. (1972) studied this question.