1. Buznikov, G. A., Chudahova, I. V., Zvezdina, N. D.: The role of neurohumours in early embryogenesis. I. Serotonin content of developing embryos of sea urchin and loach. J. Embryol. exp. Morph.12, 563–573 (1964)
2. Cairnie, A. B., Lamerton, L. F., Steel, G. C.: Cell proliferation studies in the intestinal epithelium of the rat. Exp. Cell Res.39, 523–538 (1965)
3. Dupont, J-R., Biggers, D. C., Sprinz, H.: Intestinal renewal and immunosympathectomy. Arch. Path.80, 357–362 (1965)
4. Erspamer, V.: Pharmacology of indolealkylamines. Pharmac. Rev.6, 425–487 (1954)
5. Gabella, G., Costa, M.: Adrenergic fibres in the mucous membrane of guinea pig alimentary tract. Experientia (Basel)24, 706–707 (1968)