Cell membrane 



fig 2 6 The structure of a composite animal cell as revealed by the light microscope (A) and 

 the electron microscope (B-F); diagrammatic. The centriole in D is shown in cross section. 

 (The authors are indebted to Keith R. Porter, George E. Palade, and Don W. Fawcett for 

 discussions concerning this figure but accept full responsibility for any errors of interpretation 

 in view of the recognized incompleteness of knowledge concerning the fine structure of cells.) 



18 



