The murine Cl⁻/HCO⁻₃ exchanger Ae3 (Slc4a3) is not required for acid-base balance but is involved in magnesium handling by the kidney.
Kampik NB, Gehring N, Schnitzbauer U, Hennings JC, Hübner CA, Wagner CA. Cell Physiol Biochem. 2014; 34(5):1566-77. Epub 2014 Oct 31.