nt biological marker of histamine metabolism in human colonic mucosa. Inflamm Res 2002;5I(suppl):S87-8. Medline 70.0 Kuefner MA, Schwelbeiger HG, Weidenhiller M, Hahn EG, Raithel M Both catabolic pathways of histamine via histamine-N-methyltransferase and diamine oxidase are diminished in the colonic mucosa