the synthesis of 4 % glu-polypentapeptide ( ppp ) ( i.e. , 4 glu residues per 100 amino acid residues ) and 4 % glu-ile1-ppp , in which val1 is substituted by a more hydrophobic ile residue , is carried out by copolymerizing the p-nitrophenyl-active esters of ge ( ome ) gvp and ge ( ome ) gip with their parent pentamers gvgvp and gvgip in 1:4 ratios , respectively .
C0002520
amino acid
C0061472
glu