r 



r 



t 



Fig. 3.3. Mitochondria and microsomes in the liver. Ultrathin sec- 

 tion of mitochondria from a rat liver cell. Mitochondria showing 

 internal cristae. In the surrounding cytoplasm canaliculi of the endo- 

 plasmic reticulum with dense granular material in the outer surface 

 are seen. Magnification = 25,500x. [After Palade (5).] 



67 



