+Ca9 (carbonic anhydrase IX) is an [enzyme](/wiki/Enzyme) found in human cells. It plays a key role in regulating cellular [pH](/wiki/pH), especially under low-oxygen conditions, influencing cell growth and adaptation.
+## See also
+- [Carbonic Anhydrase](/wiki/Carbonic_Anhydrase)
+- [Hypoxia](/wiki/Hypoxia)
+- [Cell Biology](/wiki/Cell_Biology)