Table 3.

Comparison of distribution of transporters in the proximal duodenum

	Brunner's glands	Crypts	Villi
CFTR	+	+	+
NKCC1	+	+	+
NBCe1	+	−/+	+
AE2	+	+	+
NHE3	−	−/+	+
AQP5	+	−	−
V-ATPase	+	+	+

+Upper crypt.