juxtaposition (plural juxtapositions) 1  The nearness of objects with little or no delimiter. 2  The extra emphasis given to a comparison when the contrasted objects are close together.
Hemolytic disease of the newborn (HDN), also known as alloimmune HDN or erythroblastosis fetalis, is a potentially fatal alloimmune condition where fetal red blood cells are destroyed by transplacentally acquired maternal antibodies. RhD is the most common offending paternal antigen.
1 Hemolytic Disease of the Newborn Caused by a High Titer Anti-Group B IgG From a Group A Mother. Pediatric Blood & Cancer 2005;45(6): 861-862. ^  Jeon H, Calhoun B, Pothiawala M, Herschel M, Baron BW. Significant ABO Hemolytic Disease of the Newborn in a Group B Infant with a Group A2 Mother.