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

Figure 8

α-cells; only the dense inner core of the cytoplasmic granule is visible. The diameter of the granules is variable within each cell. Granular endoplasmic reticulum (GR) is more prominent and parallel cisternae more frequent in the α-cells than in the β-cells. bm: basement membrane; M: mitochondrion; N: nucleus; cer: ceroid granules. X 21.000.