Reports

Hemoglobin Heterogeneity: Embryonic Hemoglobin in the Duckling and Its Disappearance in the Adult

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Science  23 Apr 1965:
Vol. 148, Issue 3669, pp. 509-511
DOI: 10.1126/science.148.3669.509

Abstract

The 7-day white Peking duck embryo contains two hemoglobins (Hb's III and IV) which are electrophoretically distinct from the two adult hemoglobins (Hb's I and II). Hemoglobin IV had disappeared in the 14-day embryo, at which time Hb's I and II are evident. The synthesis of Hb III is not restricted to embryonic life but continues in the duckling and ceases before the 10th week of development after hatching.