5. 



Glycine COOH 



t 



HCH 

 » 



Alanine 



Serine 



ITHo 



Cystine HGOC 



t 



HgN 



Aspartic acid 



KH2 



Proline CGCH 



CH^ » 



'2 ^- 



HgC 





CH- 



