Rh proteins are the proteins that express the Rh blood group antigens. Rh proteins are ammonium transporters, notably in the kidney.
alloimmunization Rhesus during pregnancy
References
Avent ND. A new chapter in Rh research: Rh proteins are ammonium transporters. Trends Mol Med. 2001 Mar;7(3):94-6. PMID: #11286764#