Description_x000D_ Application_x000D_ L-histidine has been used as a component in agar plates containing 5-fluorocytosine (5-FC) for the selection of yeast transformants. It has also been used as a component of adult mouse keratinocyte growth medium._x000D_ Packaging_x000D_ 1 kg in poly bottle_x000D_ 10 mg in glass bottle_x000D_ 25, 100 g in poly bottle_x000D_ Biochem/physiol Actions_x000D_ L-Histidine is an essential amino acid that binds to metal ions and may aid in the transport of copper. Histidine is widely present at the active sites of enzymes. It also has a role in binding of heme groups, macromolecules and phosphate groups in the binding sites of proteins._x000D_ Precursor of histamine by action of histidine decarboxylase.