Research Article
The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish Rhamdia quelen
Figure 4
Portions of two β-cells illustrating the variation in appearance of the β-granules. Rounded and angular configurations are visible. Granular endoplasmic reticulum (GR) is sparse. M: mitochondrion. X 21.000.