Table 1. Composition of buffer solutions used for Ussing chamber experiments (if not stated otherwise, all chemicals were obtained from Merck, Darmstadt, Germany).

All chemicals were diluted in aqua destillata.

	Mucosal buffer [mM]	Serosal buffer [mM]
NaCl	119.6	119.6
KCl	5.4	5.4
HCl	0.4	0.4
MgCl2 * 6 H2O	1.2	1.2
CaCl2 * 2 H2O	1.2	1.2
NaHCO 3	15.0	15.0
Na 2 HPO 4	1.2	1.2
NaH 2 PO 4	0.3	0.3
Mannitol	20.0	10.0
Glucose	-	10.0
Indomethacin (Sigma-Aldrich, Schnelldorf, Germany)	0.01	0.01