One variant phenotype of this group is known as the "weak D". One nomenclature for identifying it was developed by Fisher and Race, which uses the letters c, d, and e to mark its alleles, while an older nomenclature is named for Weiner. Phillip Levine connected this set of factors to a condition that is currently prevented 
One variant phenotype of this group is known as the "weak D". One nomenclature for identifying it was developed by Fisher and Race, which uses the letters c, d, and e to mark its alleles, while an older nomenclature is named for Weiner. Phillip Levine connected this set of factors to a condition that is currently prevented by the drug Rhogam, known as erythroblastosis fetalis or hemolytic disease of the newborn, in which a mother produces antibodies to this factor. Originally discovered in a namesake species of monkey, for 10 points, name this blood group that is usually notated by a plus or minus when noting one's blood type.
One variant phenotype of this group is known as the "weak D".
Rh blood group or Rhesus factor or equivalents