Abstract
Chemical identifications of various hemoglobin types were performed on unfractionated erythroid cells derived from chicken embryos at 5 and 7 days of development and on purified primitive and definitive cells. Proteins were pulse-labelled in primitive erythroid cells at various times of culture to identify those actually synthesized. The data show that primitive cells contain and synthesize only embryonic hemoglobins at all stages of maturation and definitive cells contain adult and minor embryonic hemoglobins, but no major embryonic hemoglobins, not even in trace amounts. These results support a model for hemoglobin switch in the chicken embryo based on cell line substitution.
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