| Type of Channel |
Mainly expressed at |
Function |
| Na-Pi type I |
Renal brush border membrane of PCT |
Sodium phosphate reabsorption from the glomerular filtrate |
| Na-Pi type II |
|
|
| IIa |
Renal brush border membrane
of PCT |
Sodium phosphate reabsorption from the glomerular filtrate |
| IIb |
Villi in small intestine |
Absorption of dietary phosphate |
|
IIc |
Renal brush border membrane of PCT |
Sodium phosphate
reabsorption from the glomerular filtrate |
| Na-Pi type III |
Renal sodium phosphate channels |
Accounts for <1% encoded channels.
May have housekeeping functions. |
