An unusually well-preserved eleven-week, 4.7 cm. human fetus exhibited active erythropoiesis in liver, and myelopoiesis in femur and humerus; the spleen was the site for sequestration and destruction of primitive erythrocytes, and the yolk sac was fibrotic. High proportions of adult type hemoglobin (A) were found in liver homogenate, and an electrophoretically distinctive fetal form of G6PD was observed.

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