rroni Hawk and Beigeiiu, Practical Phyniological Chemistry. 

 Courtesy of P. Blakiston's Son & Co., Inc. 



Fig. 5-6. Phenylalanine. 



From Hawk and Bergeim. Practical Physiological Chemistry. 

 Courtesy of P. Blakiston's Son & Co., Inc. 



Fig. 5-7. Tyrosine. 



114 



