o 

 i 



1 1 1 1 1 TT 



HISTONES FROM PEfl COTYLEDON CHROMATI 

 (tissue incubation ) , 



FRACTION NUMBER 



Fig. 9. 



Biosynthesis of pea cotyledon hlstones. (Fig. 6, Chalkley and Maurer, Proc. Natl. Acad. 

 Sci. U.S. 54, 498, 1965; reproduced with permission of rhe National Academy of Sciences.) 



T 0.5 



"I 



12 ; 



HISTOIMES FROIl^ TOBACCO CELL CHROIi«ATlN 

 (cell incubotion. 5-FDU absenti 



*^ **^ 



Fig. 10. 



Biosynthesis of histones in cultured tobacco ceUs growing exponentially. (Fig. 8, Chalkley 

 and Maurer, Proc. Natl. Acad. Sci. U.S. 54, 498, 1965; reproduced with permission of 

 the National Academy of Sciences.) 



138 



