passages.id: split_1_test_2143_passage
passages.type: progene_text
passages.text: Using monolayers of the Calu-3 cell line , a human submucosal serous cell model mounted in an Ussing chamber apparatus , we investigated the nature of the K + channels involved in basal , cAMP - and Ca2 + - stimulated anion secretion , as reflected by the transepithelial short circuit current ( I ( sc ) ) .