EXPONENTIAL 

 GROWTH 



< 



o 

 ti. 



Q. 



< 



Q. 



15 17 19 



HOURS 



Fig. 7. 

 Papilla formation as a function of culture age. 



3 



a 



E 

 O 



3. 



DRY WEIGHT 

 PROTEIN 



DNA 



15 17 19 



HOURS 



Fig. 8. 

 Semi-log plot of major cell constituents. 



UJ 



a: 



3 



3 

 E 



g 



< 

 z 



< 



O 

 Q. 

 OC 

 O 

 O 



O 



LlI 



\- 

 < 

 OH 



Fig. 9. 

 Total RNA content vs time. 



PROTEIN 



' V — 



1% papillae\ 



19 



Fig. 10. 

 Incorporation of RNA and protein precursors. 



169 



