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Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1760, USA.
The Na(+)/Ca(2+) exchanger gene family encompasses three distinct proteins, NCX1, NCX2, and NCX3, which mediate cellular Ca(2+) efflux and thus contribute to intracellular Ca(2+) homeostasis. NCX1 is expressed ubiquitously while NCX2 and NCX3 are limited to brain and skeletal muscle. NCX1 exchanges 3 extracellular Na(+) for 1 intracellular Ca(2+). In addition to transporting Na(+) and Ca(2+), NCX1 activity is also regulated by these cations. NCX1 is especially important in regulating cardiac contractility.
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