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Figure 1. Peripheral smear from a newborn with neonatal alloimmune hemolytic anemia due to ABO incompatibility is illustrated. Mother was type O/Rh+, and newborn was type B/Rh+. The spectrum of RBC abnormalities in this disorder is shown including numerous nucleated RBCs (large arrow), spherocytosis (small arrow), and polychromtophilic RBCs (double arrow).
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