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Get Support Be Involved About Us More What is Maternal Alloimmunization. All members of our organization have been directly affected by maternal alloimmunization and its resulting HDFN. We feel very strongly in our desire to represent and support those also affected by this rare condition. Hope Support and Advocacy for HDFN Our mission is to provide advocacy and support to those affected by maternal alloimmunization and its comorbid condition hemolytic disease of the fetus and newborn.