CONSTITUENTS OF THE BIOSPHERE 27 



Table VI {continued) 

 Glycine (Gly), aminoacetic acid 



R = H - (Al, N, NP, NI) H-CK-CCOH 



NHq 

 L (— ) Histidine (His), a-amino-jS(5)-imidazolyIpropionic acid 



I 

 R = imidazolylmethyl (He, B, P, I) N C-CH2— CH— COOH 



li 11 



HC CH 



\ / 



N 



H 

 L ( — ) Hydroxyproline (Hypro), 4-hydroxypyrrolidine-2-carboxylic acid 



H 



R = - (He, N, P, NI) HO— C CH; 



1 I 



HX C— COOH 



\ /H 

 N 

 H 

 L ( + ) Isoleucine, a-amino-j8-methyl-n-vaIeric acid 



R = a-methyl-«-propyl (Al, N, NP, NI) 



NH2 



CH3— CH2— CH— CH-COOH 



CH3 

 L ( — ) Leucine (Leu), a-amino-isocaproic acid 



R = isobutyKAl, N, NP, NI) CH3 NH2 



\ 1 



CH—CH2— CH-COOH 



/ 



CH3 

 L (+) Lysine (Lys), a-e-diamino-n-caproic acid 



R ^ co-amino-n-butvl (Al, B, P, I) 



NH2 

 e 6 Y |3 aj 



CH2—CH2—CH2—CH2— CH-COOH 



I 

 NH2 



L (— ) Methionine (Met), a-amino-methylthiol-w-butyric acid 



NH. 



I 

 R = methylthioethyl (Al, N, P, NI) CHa-S-CHo-CH.-CH-COOH 



