olus and to some extent in the chromatin (Serra, 1955). Most nuclear 

 lipids are probably combined with protein as lipoprotein and perhaps 

 also with RNA. In any event, nucleohistone isolated from calf thymus 

 has been reported to contain relatively large amounts of bound phospho- 

 lipid (Chayen. et al., 1959). 



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STRUCTURE AND FUNCTION OF THE NUCLEUS /111 



