MECHANISM OF ANTIBODY FORMATION 



81 



1 (— )Cystine [di-C^-thiol-a-amino- 

 propionic acid)] 



Amino Acids With Polar Side Groups 



NH2 



I 

 HOOC— C— CH2 S 



H 



NH2 



I 

 HOOC— C CH2 S 



I 

 H 



NH2 



1 C-)-Mcthionine (y-methylthiol- HOOC-C-CH2-CH2-S-CH3 



a-amino-n-butyric acidj 1 



H 



1(— )-Serine (jg-hydroxy-a-amino- 

 propionic acid) 



NH2 



HOOC— C— CH2— OH 



I 

 H 



NH2 H 



1 (— )-Threonine (a-amino-jg-hydroxy- ttqqp n n OH 



n-butyric acid) 1 I 



H CH3 



1(— )-Hydroxy-proline (4-hydroxy- 

 pyrrolidine-2-carboxylic 

 acid) 



CH2 CH— OH 



HOOC— CH CH2 



\/ 



N 

 H 



1(— )-Tryptopbane (/3-3-indole- 

 a-amino-propionic acid) 



NH2 

 HOOC— C— CH2— C- 

 H HG 



/\ 



N 

 H 



