The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish Rhamdia quelen

Figure 3

Periphery of normal islet after fixation in osmium tetroxide. β-granules (B) are unchanged. α- granules (A) lack the distinct outer mantle. Mitochondria (M) are larger and more numerous in β-cells. Both cell types contain ceroid granules (curved arrows). A centriole is indicated by straight arrows. G: Golgi complex. X 9500.