INTERMIiDlATi: RliACTIONS IN PROTEIN SYNTIIhSlS 169 



ing of amino acid to microsomal UNA or also to the torming ol proteins remains 

 to be answered. 



The ribonucleoprotein particles are, however, initially implicated in the forma- 

 tion of completed protein. We have been talking today for the most part about 

 reactions which precede this polymerization and which require only the soluble 

 elements of the cell. 



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