True.
Proteins are composed of amino acids. The amino acids that comprise proteins are connected via peptide linkages. They are composed of a linear chain folded into a globular structure.
The synthesis of protein requires the participation of 20 amino acids. These are the so-called proteinogenic amino acids. However, other amino acids, like ornithine, are classified as non-proteinous amino acids since they do not contribute to the synthesis of proteins.
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