SUBCHLLULAR PARTICLES 



I' / 



■ST' 19*"TV 



I m^-v jy, 



% "" 





% 1^^ 



'•■'■^tv»%:i 







'^ 



Fig. 4. Electron micrograph of section of microsomal fraction. The bulk of the fraction is 

 made of fra,t;mcnts of ergastoplasm. The ribonuclcoprotcin ijranules are readily identified. 

 X 12,800. 



Fig. 5. Electron microi^rajih of SL'Ction of purified 'fluffy layer' (28). Note long lengths of 

 ergastoplasm, in which both endoplasmic reticulum membranes anil ribonucleoprotein granules 

 are readily identified. Mitochondria arc lairK well preserved. X /;4. -=)()• 



