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Amino acids are the building blocks of proteins, and they consist of a central carbon atom (the α-carbon) to which an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a side chain (R group) are attached. The general structure of an α-amino acid can be represented as: NH2-CHR-COOH, where R represents the side chain that distinguishes one amino acid from _________ ______ ________ _________ ___ _________ _________ __________ ___.
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