1. Baker, J. R.: Principles of biological microtechnique. London: Methuen 1958.
2. Baum, J., Simons, B. E., Unger, R. H., Madison, L. L.: Localization of glucagon in the alpha cells in the pancreatic islet by immunofluorescent technics. Diabetes 11, 371?374 (1962).
3. Bussolati, G., Pearse, A. G. E.: Immunofluorescent localization of calcitonin in the ?C? cells of pig and dog thyroid. J. Endocr. 37, 205?209 (1967).
4. - Rost, F. W. D., Pearse, A. G. E.: Fluorescence metachromasia in polypeptide hormone-producing cells of the APUD series, and its significance in relation to the structure of the precursor protein. Histochem. J. (1969, in press).
5. Capella, C., Solcia, E., Vassallo, G.: Identification of six types of endocrine cells in the gastrointestinal mucosa of the rabbit. Arch. Histol. Jap. 30, 479?495 (1969a).