270 



v475c 



t 



\49C 





647 



6/7<< 



\r 





\634 



Ze/n 



Food 



90 



\J53C & 



X632\644? 



^52 



^^690? 



i 



Days 



FIGURE 11. EXPERIMENTS WITH ZEIN. Neither growth nor main- 

 tenance can be secured when zein is the sole protein in the dietary. [From j 

 the Journal ojf 'Biological Chemistry, volume 17.] 



