L-Histidine by MP Biomedicals is a high purity amino acid. This is an -amino acid which contains an -amino group, a carboxylic acid group, and an imidazole side chain, classifying it as a positively charged amino acid at physiological pH. This preparation is available as a crystalline white powder which is soluble in HCl. It is classified as an essential amino acid, since it is not produced in the body. It is also a precursor to histamine, a vital inflammatory agent in immune responses. CAS No. 71-00-1 Quantity Provided: 25 gm per pack Molecular Formula: C6H9N3O2 Molecular Weight: 155.2 Soluble in waterL-Histidine is widely used in chemical and biological sectors. L-Histidine has been succesfully used to study cultures of the human T-lymphoblastic leukemia cell line MOLT-4 to research the modulation of apoptosis. Exogenous histidine has been shown to enhance the biosynthesis of lovastatin by cultured Aspergillus terreus. Histidine has also been utilized as a single nitrogen source to probe swarming in Pseudomonas aeruginosa on agar. It is generally used in media preparation.