m. 



Figure 3-26. (a) Electron Micrograph of Small Portion of Cytoplasm 

 of Parenchymatous Liver Cell, showing array of nine elongated profiles 

 (e^, eg) of the rough-surfaced variety which in three dimensions corresponds 

 to a pile of preferentially oriented cisternae. Numerous small particles of 

 high electron density (small granules of Palade, ribosomes) are attached to 

 the outside surface of the membrane limiting the cisternae. Similar particles 

 appear freely scattered in the intervening cytoplasm. Profiles of five mito- 

 chondria (m) are also visible, (b) Electron Micrograph of Section of 

 Microsomal Fraction Isolated from Liver Homogenate. This fraction con- 



{Contin. on opposite page.) 



56 / CHAPTER 3 



