Hi, I`m not looking for a method but for an answer: Does anybody know anything about the intraluminal pH of the ER ? Is there any literature on it ? Would be glad to hear something about it! Regards, Ulrike -- Ulrike Boeer Depts. of Biochemistry, Dermatology Georg-August-University, Goettingen, Germany Email: uboeer at gwdg.de Tel: xx49 551 39 5959 / 5978