High Quality Content by WIKIPEDIA articles! In biochemistry and molecular biology, a residue refers to a specific monomer within the polymeric chain of a polysaccharide, protein or nucleic acid For example, one might say, "The histidine residue is considered to be basic due to its imidazole ring " Note that a residue is different from ожиын a moiety, which, in the above example would be constituted by the imidazole ring or "the imidazole moiety" Note the origin of this usage: during the process by which monomeric building blocks (e g amino acids) are strung together into a polymeric chain (e g a protein), some material (typically adding up to one molecule of water) is discarded from each building block, and only a "residue" of the building block ends up in the finished product For example, a residue is an individual amino acid in a peptide chain.  Souveni2010 г Мягкая обложка, 92 стр ISBN 6130348347.