G. Gastrointestinal epithelia as barriers to lumina( histamine of microbial origin. Z Gastroenteml 1998;36:12-7. 43.•' Saltier J, Lorenz W Kubo K, Schmal A, Sauer S, Luben L. Food-induced histaminosis under diamine oxidase (DAO) blockade in pigs: further evidence of the key role of elevated plasma hista