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.