PT	Renal proximal tubule
KO	Null (knock-out) mice
WT	Wild-type mice
PX	Paracellular permeability to ion X
(c)TAL	(cortical) Thick ascending limb of the Henle’s loop
PTH	Parathyroid hormone
FGF23	Fibroblast growth factor 23
ES	Embryonic stem cells
HET	Heterozygotes
AQP1	Aquaporin I
NKCC2	Sodium–potassium–chloride cotransporter II
NCC	Sodium–chloride cotransporter
CAII	Carbonic anhydrase II
BUN	Blood urea nitrogen
PMCA1b	Plasma membrane Ca2+ ATPase, isoform 1b
NHE3	Sodium–hydrogen exchanger type 3
CaSR	Calcium sensing receptor