Amino acids

Amino acids are organic molecules, formed by one carboxylic group (COOH), one amino group (NH2), one hydrogen molecule and one side-chain, connected together by one central carbon atom. The side-chain varies according to the amino acid, which means that each of the 20 existing amino acids has its own side-chain. Amino acids are classified as essential, semi-essential or non-essential. All are combined by peptide chains, forming peptides and proteins, which are necessary for growth, repair and maintenance of the body's tissues and organs.

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