Source:http://linkedlifedata.com/resource/umls/id/C0035406
MSH: Erythrocyte isoantigens of the Rh (Rhesus) blood group system, the most complex of all human blood groups. The major antigen Rh or D is the most common cause of erythroblastosis fetalis.,NCI: A blood group system based on recognition of inherited differences in the Rhesus antigen as expressed on erythrocytes.