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Ile-Gly-Gly-Gly is a tetrapeptide consisting of L-isoleucine and three glycine residues. L-isoleucine is a branched-chain amino acid essential for protein synthesis and muscle metabolism. Glycine is involved in various metabolic processes, including neurotransmitter function and collagen synthesis. This peptide might contribute to muscle repair and protein synthesis, and support general metabolic and physiological functions through the combined effects of isoleucine and glycine.