title: Frequency of alloimmunization to c (Rh4) in R1R1 patients presenting with anti-E.
authors.forename: J L
authors.initials: JL
authors.lastname: Swanson
mesh_terms: D005787:Gene Frequency; D006239:Haplotypes; D006801:Humans; D012189:Retrospective Studies; D012203:Rh Isoimmunization / Q000453:epidemiology*; D012204:Rh-Hr Blood-Group System / Q000276:immunology*
chemical_list: D012204:Rh-Hr Blood-Group System