KEIMBAHN-DETERMINANTS 



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a. Nuclear. Nucleoli. It seems certain that 

 bodies of a nucleolar nature behave as keimbahn- 

 determinants. There are three or more kinds of 

 bodies that are spoken of as nucleoli. Of these may 

 be mentioned (1) the true nucleoli or plasmosomes, (2) 

 karyosomes or chromatin-nucleoli, and (3) douhle-nu- 



