A free amino group is present at one end of the peptide chain and a free carboxyl group at the other end. By convention, the free amino group is drawn on the left. Once linked in a peptide chain, amino acids are called amino acid residues (or residues for short). Amino acids and immune function. A deficiency of dietary protein or amino acids has long been known to impair immune function and increase the susceptibility of animals and humans to infectious disease. However, only in the past 15 years have the underlying cellular Cited by: Proteins are biopolymers of. acids, so named because the amino group is bonded to the carbon atom, next to the carbonyl group. The physical and chemical properties of a protein are determined by its constituent amino acids. The individual amino acid subunits are .
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