82 



UNITY AND DIVERSITY IN BIOCHEMISTRY 



OH 

 I H 



c c 



/\ // \ 



HC CH HC CH 



II I I II 



HC CH HC CH 



\ // \ / 



C C 



I I 



CH2 CHj 



NH2 O O I 



I II II I 



CH2— CH-C-NH— CH-C— NH-CH 



I Tyr Phe | 



s c=o 



I Cys I 



S Asp (NH2) NH 



I O O 



I II- II 



CH2-CH— NH-C-CH~NH-C-CH-CH2— CH2— CONH2 



I 



c=o 



CH2 



I 



CONHa 



Glu (NH2) 



Gly (NH2) 



HaC-N Pro O Arg O 



\ II II 



CH— C— NH— CH— C— NH--CH2— CONH, 



/ I 



H2C— C CH2 



H2 I 



CHa 



I 

 CHa 



I 

 NH 



I 

 C 



/ \ 

 HN NHa 



Beef vasopressin 



REFERENCES 



Bricas, E. and Fromageot, CI. (1953). Naturally occurring peptides, Advances in 



Protein Chemistry, 8, 1-25. 

 Desnuelle, p. (1953). The general chemistry of amino acids and peptides, in 



Neurath, H. & Bailey, K., The Proteins, Vol. I, part A, 87-180, Academic 



Press, New York. 

 FRUTON,J.S.(1949).Thesynthesisofpeptides,^fift>a«cejmPro<«ViC/jewwfry, 5, 1-83. 



