ÓSTBERG YNGVE 286,531 The entero-insular endocrine organ in a cyclostome, myxine glutinosa. A light and fluorescence,microscopical,histochemical and ultrastructural study,aiming to give some evolutionary aspects on the origin of islet parenchymal cells and the entero-insular axis. Umea 1976 Universitet 4° 3.41,il.+wkł.s. nlb. 2. Umea University Medical Dissertations new ser. 15 Akademisk avhandlinag