1. Abramowitz, A.: The pituitary control of chromatophores in the dogfish. Amer. Naturalist 73, 208?218 (1930).
2. Ackerman, G. A.: Histological observations of the oxidative enzyme activity and hemaglobin synthesis in the developing erythrocytic cells of the embryonic liver. Anat. Rec. 144, 239?241 (1962).
3. Alpen, E., Cranmore, D.: Observations on the regulation of erythropoiesis and on cellular dynamics by Fe59 autoradiography. In the kinetics of cellular proliferation (F. Stohlman, Jr., ed.), p. 290?295. New York and London: Grune & Stratton 1959.
4. Ban, T., Masai, H., Okada, S., Kaneki, S., Ishino, T., Tanemura, H., Konotsu, T.: Experimental and histological studies on the autonomic centers. Acta anat. Nippon. 31, 64?65 (1956).
5. Bergmann, W., Lindner, E., Andres, K.: Über Synapsen an endokrinen Epithelzellen und die Definition sekretorischer Neurone, Untersuchungen an Zwischenlappen der Katzenhypophyse. Z. Zellforsch. 77, 282?298 (1967).