Sodium–hydrogen antiporter

The sodium–hydrogen antiporter or sodium–hydrogen exchanger is a membrane protein found in many cells, and especially in those of the nephron of the kidney. It is primarily responsible for maintaining the balance of sodium.

Isoforms
There are several isoforms of the antiporter:
 * Sodium–hydrogen antiporter 1
 * Sodium–hydrogen antiporter 2
 * Sodium–hydrogen antiporter 3
 * Sodium–hydrogen antiporter 5
 * Sodium–hydrogen antiporter 6
 * Sodium–hydrogen antiporter 8