

ir-: 





Fig. 20. A. Section through a guinea pig pancreatic cell showing a few 

 mitochondria with their inner cristae, and the endoplasmic reticulum 

 lined with ribosomes. Free ribosomes can be seen between the cisternae. 

 The large intracisternal granules are the secretory products. Magnifica- 

 tion: X 22,000 (courtesy Dr G. E. Palade). 



