These amino acids are utilized for synthesis of body proteins as well as acting as neurotransmitters or as precursors to neurotransmitters. Protein-containing substances in our body include muscle, blood, ligaments, skin, tendons, internal organs, glands, nails, and hair . Enzymes, hormones, antibodies and genes are also comprised of protein. Essential amino acids include isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Non-essential amino acids can be synthesized in the liver from other amino acids.
All amino acids found in protein have the L configuration.
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