Mm 



*§■ • -; % 



: 



Fig. 



Structure 



(a) Electron micrograph of neu- 

 tralized flock from acidified alkaline-salt extract of trout sperm flagella. 

 Unshadowed (x 17,400). (b) Optical micrograph of network produced 

 from a gel specimen from trout sperm flagella at pH 4.0 in the absence of 

 salts. Stained in gentian violet (x300). (c) Electron micrograph of speci- 

 men (b). Unshadowed (x 34,400). [Note added in proof. Scale in (c) should 

 read 0.1 /*.] 



206 



