BLONZ: I have an unfortunate tendency to develop hives and was told that a low-histamine diet can help in some cases. I have been having difficulty finding a list of foods showing histamine content.-- ...

including histidine, it was noticed that the last-named substance formed complexes that were much more stable than those of any other amino-acid studied.

Analysis of a bacterial transcriptional repressor protein indicates that metal-catalyzed oxidation of histidine residues can provide oxidative stress control in a cysteine-independent fashion.