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Glossary AB CD EF GH IJ KL MN OP QR ST UV WX YZ Amino Acid The class of molecules that consist of an amino (NH2) group at one end, an acidic carboxyl (COOH) group at the other end, and a side chain in the middle. The identity of the amino acid is determined by the side chain. Amino acids join together in peptide bonds to form proteins. |