Clinicаl Histоry: A 45-yeаr-оld mаn оf African ancestry with sickle cell disease presents with a delayed hemolytic transfusion reaction. Antibody screen reveals anti-Fy3. RBC phenotype is Fy(a–b–). Question: What does the presence of anti-Fy3 suggest about this patient’s genotype? (M1.3)