STRUCTURE OF AMINO ACIDS 
Phenylalanin, e-amino, 6-phenyl propionic acid. 
H H 
O 
/\ 0-4 
H NHp 
Serine, a-amino, 8-hydroxy propionic acid. 
OH NHo2 
Cystine, a-diamino, 6-dithiolactylic acid. 
sS——————8 
| | 
ica i—O-8 
BONE: H—C—NHe 
COOH COOH 
Leucine, isobutyl a-amino acetic acid. 
CH3 
»CH—CH:—CH—CO0H 
CHs | 
NH2 
Isoleucine ethyl methyl, a-amino propionic acid. 
CH3 CH—CH—COOH 
CH;—CH.” | 
NH2 
Valine, e-amino, isovalerianic acid. 
CH; NHe 
| O 
HO —C-0“ 0H 
CH, H 
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