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L-histidine is an essential amino acid that serves as a building block for proteins and plays important roles in various biochemical processes in the body.  
Essential Amino Acid: L-histidine is considered an essential amino acid, which means it cannot be synthesized by the body and must be obtained through the diet. It is particularly important during periods of growth and development.
Protein Building Block: L-histidine is incorporated into proteins during protein synthesis. It is one of the 20 standard amino acids that are used to form the primary structure of proteins.
Precursor to Histamine: L-histidine is a precursor for the synthesis of histamine, a biogenic amine involved in various physiological processes. Histamine acts as a neurotransmitter, regulating immune responses, gastric acid secretion, and allergic reactions.